|
|
|
|
|
NASA/KSC ACRONYM LIST
A 3AAL Three Axis Acoustic Levitator A Angstrom A Acceleration A Aft A Alpha A Ampere A Analog Signal A&A Advertise and Award A&E Architects and Engineering A&E Architectural and Engineering A&I Assembly and Installation A&L Approach and Landing A&P Attitude and Pointing A&PS Administration and Program Support (MSFC Directorate) A&R Automation and Robotics A&RC Application and Resource Control A&TA Assembly and Test Area A&V Assembly and Verification A/A Air to Air A/C Air Conditioning A/C Aircraft A/C Associate Contractor A/D Analog to Digital A/E Activity Elements A/E Architectural and Engineering A/F Air-to-Fuel Ratio A/FM Air/Firing Mechanism A/G Air to Ground A/L Approach/Landing A/L Approach and Landing/Autoland A/L Airlock A/L Autoland AA Antenna Assembly AAA Avionics Air Assembly AAC Aft Access Closure AAFE Aeroassist Flight Experiment ABC Audio Bus Coupler ABCL As Built Configuration List ABHRS As Built Hardware Reporting System ABOLT Acquire Bolt AC Alternating Current AC Assembly Complete AC Comptroller Office ACBM Active CBM ACC Aft Cargo Carrier ACCMS Advanced Checkout, Control, and Maintenance System ACCS Advanced Checkout and Control System ACES Acoustic Containerless Experiment System ACIP Assembly Configuration and Integration Panel ACO Assembly and Checkout Officer ACP Automated Change Processing ACR Active Cavity Radiometer ACRIM Active Cavity Radiometer Irradiance Monitor ACRBC Acceptance, Checkout, Retest, and Backout Criteria ACRC Assured Crew Return Capability - Now ACRV ACRV Assured Crew Return Vehicle ACS Advanced Camera for Surveys (Hubble Space Telescope) ACS Atmosphere Control Systen ACS Attitude Control System ACSM ACS Moding ACTS Advanced Communications Technology Satellite ACU Arm Computer Unit ACU Arm Control Unit AD Active Device AD Aperture Door AD Attachment Device ADC Affiliated Data Center ADEOS Advanced Earth Observing Mission ADF Air Diffuser ADP Acceptance Data Package ADP Automated Data Processing ADPS Acceptance Data Package System ADS Attitude Determination System ADSF Advanced Directional Solidification Furnace AEA Antenna Electronics Assembly AEG AEG Telefunken AEPI Atmospheric Emission Photometric Imaging AERO Aerodynamic AERO Aerosurfaces AERO Atmospheric Flt Supt AES Analog Event System AES Atmosphere Exchange System AES Auger Electron Spectroscopy AESC Aerojet Electrosystems Company AESD Airlock External Stowage Devices AESE Airborne Electrical Support Equipment AET Aerosurface End-to-End Test AETL Approved Engineering Test Laboratory AEWG Active Experiment Working Group AF Aft Fuselage AF Airframe AF Air Force AF Audio Frequency AFA Airframe Assembly AFAD Armed Forces Acquisition Document AFALD Air Force Acquisition Logistics Division (WPAFB) AFB Air Force Base AFC Aerodynamic Flight Control AFC Automatic Flight Control AFC Automatic Frequency Control AFCE Automatic Flight Control Equipment AFCS Automatic Flight Control System AFD Aft Flight Deck AFD Assistant Flight Director AFDCP Aft Flight Deck Control Panel AFDO Aft Flight Deck Operator AFDPDB Aft Flight Deck Power Distribution Box AFE Aeroassist Flight Experiment AFE American Flight Echocardiograph AFEB Award Fee Evaluation Board AFEC Award Fee Evaluation Committee AFETR Air Force Eastern Test Range (ESMC preferred) AFETRM Air Force Eastern Test Range Manual AFF Acceptance and Ferry Flight AFFTC Air Force Flight Test Center (Edwards AFB) AFGE Association of Federal Government Employees AFGL Air Force Geophysics Laboratory AFGWC Air Force Global Weather Center AFI Air Force Instruction (Most AFRs have been changed to AFIs.) AFI Automatic Fault Isolation AFL Autoland Flight Tests AFLC Air Force Logistics Command AFM Air Force Manual AFO Announced Flight Opportunity AFO Announcement of Flight Opportunities AFP Air Force Program AFPD Authorization for Program Development AFPRO Air Force Plant Representatives Office AFR Air Force Regulation AFRPL Air Force Rocket Propulsion Laboratory (EAFB) AFRSI Advanced Flexible Reusable Surface Insulation AFS Air Force Standard AFSC Air Force Systems Command AFSCF Air Force Satellite Control Facility AFSCF Air Force Satellite/Spacecraft Control Facility AFSCN Air Force Satellite Control Network AFSIG Ascent Flight Systems Integration Group AFSSD Air Force Space Systems Division AFSWC Air Force Special Weapons Center (Holloman AFB) AFT Aerodynamic Flight Test AFT Atmospheric Flight Test AFT Autogenic Feedback Training AFTA Acoustic Fatigue Test Article AFTA Aft Frame Tilt Actuator AFTE Autogenic Feedback Training Experiment AFTEC Air Force Test and Evaluation Center AFV Antiflood Valve AFZES Analytical Float Zone Experiment System AG Artificial Gravity AG Attitude Gyro AGAA Attitude Gyro Accelerometer Assembly AGAP Attitude Gyro and Accelerometer Package AGB Adjustable Grapple Bar AGOSS Automated Ground Operations Scheduling System AHU Air Handling Unit AI Artificial Intelligence AIM Aeronomy of Ice in the Mesosphere AIM Automated Informed Maintenance AIMS Automated Informed Maintenance System AIO Analog Input/Output AIRS Atmospheric Infrared Sounder AIS Action Item Sheet AIS Airlock Illumination Subassembly AIS Analog-In Single-Ended AIST Agency of Industrial Science and Technology AIT Aeritalia AIU Abort Interface Unit AIU Avionics Interface Unit AJ Assembly Jig AKM Apogee Kick Motor A/L Approach and Landing A/L Autoland AL Air Lock AL/EMU Airlock/Extravehicular Mobility Unit ALAE Atmospheric Lyman Alpha Experiment ALAS Approach Landing Autopilot System (Subsystem) ALAS Automatic Landing Autopilot Subsystem ALC Aft Load Controller ALC Air Logistics Center ALC Audio Load Compensator ALC Augmented Landing Site ALC Automatic Level Control (Camera) ALC Automatic Light Control ALCA Aft Load Control Assembly ALCA Automatic Level Control Assembly ALDO Activity Level Dependent Operations ALE Airport Landing Equipment ALE Airport Lighting Equipment ALERT Acute Launch Emergency Reliability Tip ALGOL Algorithmic Language ALIO Activity Level Independent Operations ALM Alarm ALPHA Angle of Attack (Pitch) ALPHA Right Ascension ALPS Approach and Landing Procedures Simulator ALRUTS Automated Line Replaceable Unit Tracking System ALS Advance Logistics System ALS Advanced Launch System ALS Airlock System (ECLS) ALS Alternate Landing Site ALS Approach Landing System ALS Automatic Landing System ALSA Astronaut Life Support Assembly ALSARM Advanced Life Support Automated Remote Manipulator ALSE Astronaut Life Support Equipment ALSS Airlock Support System (Subsystem) ALT Alternate ALT Altimeter ALT Altitude ALT Approach and Landing Test ALTM Altimeter ALTR Approach and Landing Test Requirement ALU Arithmetic Unit AM Actuator Mechanism AM Administration and Management Operations (KSC Directorate) AM Alpha Meter AM Ammeter AM Amplitude Modulation AM Antenna Management AMA Air Material Area (now Air Logistics Centers) AMB Ambient AMC AMERICOM satellite AMC Automatic Mixture Control AMCA Aft Motor Control Assembly AMCP ADL Master Control Program AMDS Advanced Missions Docking Subsystem AMEC Aft Master Events Controller AMF Abort Motor Facility AMF Apogee Motor Firing AMF Astronaut Memorial Foundation AMG Activation Management Group AMI Absolute Memory Image AMI Airspeed Mach Indicator AMI Alpha/Mach Indicator AML Approved Materials List AMLC Asynchronous Multiline Controller AMOOS Advanced Maneuvering Orbit-to-Orbit Shuttle AMP Ampere AMPR Aeronautical Manufacturers Planning Report AMPR Aeronautical Manufacturers Progress Report AMPS Atmosphere, Magnetosphere, and Plasmas in Space AMPS Atmospheric Magnetospheric Plasma System AMPTE Active Magnetospheric Particle Tracer Explorers AMPU Automated Maneuver Planning Utility AMR Atlantic Missile Range AMRV Astronaut Maneuvering Vehicle AMS Acoustic Measurement System AMS Actuation Mechanism Subsystem AMS Amplifier AMS Amplifier Subsystem AMSU Advanced Microwave Sounding Unit ANSI American National Standard Institute AO Assembly Order AO Atomic Oxygen AOA Abort Once Around AOA Annual Operating Agreement AOH Assembly Operations Handbook AOP Assembly Ops AP Application Processor AP Associated Press APAS Androgynous Peripheral Attachment System APC Adaptive Payload Carrier APCS Automated Project Control System - ARTEMIS APCU Assembly Power Converter Unit APDS Androgynous Peripheral Docking System APFR Articulating Portable Foot Restraint API Application Programming Interface APID Applications Process Identification APM Advanced Pressurized Module APM Attached Pressurized Module APPCM Arm Pitch Plane Change Mode APS Acquisition Processor Subsystem APS Automated Payload Switch APS Auxiliary Power Supply AR Atmosphere Revitalization ARC Ames Research Center ARC Aggregation of Red Cells ARCU American-to-Russian Converter Units ARIS Active Rack Isolation System ARM Accident Report Meeting ARP Automated Release Processing ARS Air Revitalization System ARS Archive and Retrieval Subsystem (PPCU) ARTEMIS Project Management Software System - Metier Product ARTS Automated Resource Tracking System - ARTEMIS ASCII American Standard Code for Information Interchange ASCR Assured Safe Crew Return ASDA Area Smoke Detector Assembly ASE Airborne Support Equipment ASP Attitude Sensor Package ASRC Arctic Slope Regional Corporation ASRS Automated Support Requirements System ASSY Assembly AST Astro Star Tracker ASTER Advanced Spaceborne Thermal Emission and Reflection Radiometer ASTG Aerospace Test Group ATC Absolute Time Command ATCS Active Thermal Control System ATE Automated Test Equipment ATLAS Atmospheric Laboratory for Applications and Science ATMOS Atmospheric Trace Molecule Spectroscopy ATP Accelerated Training Program ATP Acceptance Test Procedure ATP Authorization to Proceed AWAD Assembly Work Authorization Document B B Bit B&P Budgetary and Planning B&W Black and White B-1 DIV B-1 Division (Rockwell) B/A Bank Angle B/A Barometric Altimeter B/A Buffer Amplifier B/C Bench Check B/L Baseline B/O Booster Orbiter B/O Breakout B/O Burnout B/SC Brake Skid Control B/SMPL Bits per Sample B/U Backup B/V Bleed Valve B/W Black and White B/sec Bits per Second BA Bank Angle BA Breathing Air BAC Boeing Aircraft Company BAC Booster Assembly Contractor BAC Buffer Access Card BACS Body Axis Coordinate System BAI Barometric Altitude Indicator BAIR Breathing Air BAL Balance BAN Budget Allocation Notice BARB Ballast Aerating Retrieval Boom BARO Barometer BARS Baseline Accounting and Reporting System BASD Ball Aerospace Systems Division BASIS Business and Support Information Services BASS Backup Avionics System Software BATT Battery BB Breadboard BBC Before Business Clearance BC Battery Charger BC Binary Counter BC Bus Coupler BCCT Break Control Command Transducers BCD Binary Coded Decimal BCE Backup Control Electronics BCE Bus Control Element BCFS Backup Flight Control System BCH Binary Coded Hexadecimal BCH Bose-Chaudhuri-Hocquenghem (Computer Code) BCN Beacon BCP Base Condemnation Percent BCP Benchmark Control Point BCR Bar Chart Report BCRD Basic Consolidated Requirements Document BCRT Binary Code Range Time BCT Bus Configuration Table BCU Bus Control Unit BCWP Budget Costs for Work Performed BCWS Budget Costs for Work Scheduled BD Band BD Binary Decoder BD Binary Digit BD Binary Discrete BD Board BDA Backup Drive Amplifier BDA Bermuda Island BDA Bermuda (STDN) BDA Blast Danger Area BDA Backup Drive Amplifier BDC Bi-Directional Converter BDC Bit Error Rate BDCF Baseline Data Collection Facility BDCR Baseline Document Change Request BDD Baseline Definition Document BDRT BFS Discrepancy Report Tracking BDT Block Data Transfer BDY Body BDYFLP Body Flap BECO Booster Engine Cutoff BER Bit Error Rate BESS Biological Experiment Scientific Satellite BESS Biomedical Experiment Scientific Satellite BESS Biomedical Experiment Support Satellite BEST Black Employee Strategy Team BEST Booster Exhaust Study Test BET Best Estimate of Trajectory BETA ANGLE Sideslip Angle BEWS Blast Environment Wave Simulator BF Beat Frequency BF Body Flap BFC Backup Flight Control BFC Backup Flight Controller BFC Body Flap Control BFCS Backup Flight Control System BFL Back Focal Length BFL Bakersfield (TACAN Station) BFO Beat Frequency Oscillator BFRP Boron Fiber Reinforced Plastics BFS Backup Flight System BFZES Breadboard Float Zone Experiment System BH/MP Breather Hose/Mouthpiece BHD Bulkhead BHN Brinell Hardness Number BHP Brake Horsepower BHS Base Heat Shield BIA Bus Interface Adaptor BIN Business and Information Network BIPROP Bipropellant BIO Bio Research Module BIO Biological BIO Bioseparation BIOMED Biological Medicine (Medical) BIOS Biological Satellite BIS Biocide Injection System BIT Binary Digit BIT Built-in Test BITE Built-in Test Equipment BIU Buffer Interface Unit BIU Bus Interface Unit BK Back BK Brake BKHD Bulkhead BLK Block BLOW Booster-Lift-Off Weight BLR Boiler BLS Bottom Left Side BLV Bleed Valve BLWR Blower BM Basal Metabolism BM Business (Branch) Manager BM Body Mounted BMA Body-Mounted Accelerometer BMAG Body-Mounted Attitude Gyro BMAP Buffer Map BMB Base Maintenance Building BME Bench Maintenance Equipment BMFT German D-1 Spacelab Payload BMMD Body Mass Measuring Device BMS Background Measurement Satellite BMU Bus Monitor Unit BN Ballistic Number BO Breakout Box BOB Best on Best BOC Base Operations Contract BOD Beneficial occupancy Date BOE Break of Entry BOF Beginning of File BOI Break of Integrity BOM Beginning of Month BOM Bill of Materials BOP Baseline Operations Plan BOPACE Boeing Plastic Analysis Capability for Engines BOS Backup Operating System BOS Bright Object Sensor BOT Beginning of Tape BOT BOTSWANA (STDN) BOW Bill of Work BP Back Pressure BP Bandpass BP Barber Pole BP Blood Pressure BP Boilerplate BPD Baseline Program Documentation BPI Bits per Inch BPM Beats per Minute BPMS Blood Pressure Measuring System BPR Bypass Ratio BPS Bits Per Second BPT Body Point BPV Bipropellant Valve BR Bit Rate BRAVO Business Risk and Value of Operation in Space BRCS Basic Reference Coordinate System BRG Bearing BRK Brake BRKT Bracket BRM Biological Research Module BRPM Breath Rate per Minute BRRS Banana River Repeater Station BRS Bottom Right Side BRT Bright BS Block Specification BSC Brake Skid Controller BSDP Booster Stage Discharge Pressure BSE Booster Systems Engineer BSI Basic Shipping Instructions BSI Boeing Services International, Inc. BSM Booster Separation Motors BSM Booster separation motor BSR Basic System Release BSR Bite Status Register BSRM Booster Solid Rocket Motor BSS Backup System Services BSTR Booster BT Burn Time (Engine) BTC Bus Tie Contractor BTC Binary Time Code BTMS Body Temperature Measuring System BTR Burn Time Remaining BTR Boom Time Remaining BTR Bus Transfer BTU Bus Terminal Unit Btu British Thermal Unit BU Backup BUC Backup Computer BUC Buckhorn, CA (GSTDN) BUFF Buffer BUOU Backup Optical Unit BUR Backup Rate BW Bridgewire BW Bandwidth BX Box BY Budget Year BYP Bypass C C Candle C Capacitance C Celsius C Centigrade C Coefficient C Complete C Constant C One Hundred c Cycle C&D Control and Display C&DH Command and Data Handling C&DS Command and Data Simulator C&M Control and Monitoring C&T Communications and Tracking C&TSS Communication and Tracking Subsystem C&W Caution and Warning C3VP Canadian CloudSat/CALIPSO Validation Project C-Band 3900 to 6200 MHz C-BD C-Band C-C Carbon-Carbon C-to-C Computer-to-Computer C/C Combustion Chamber C/D Countdown C/F Center Frequency C/L Checklist C/L Closed Loop C/O Changeout C/O Checkout C/O Contamination/Overpressure C/O Cutoff C/P Cold Plate C/R Commutation Rate C/S Counts per Second C/SCSC Cost/Schedule Control Systems Criteria C/W Carrier Wave C/W Caution and warning CA California CA Carrier Aircraft CA Contingency Abort CA Cone Angle CA Contract Award CA Corrective Action CA Cost Account CAB Cabin CAB Cabinet CAB Civil Aeronautics Board CAB Cost Audit Board CACB Center Aisle Connector Bracket CACC Communications and Configuration Console CACON Cargo Container CAD Computer Aided Design CAD/CAM Computer Aided Design CADE Controller/Attitude-Direct Electronics CADS Command and Data Simulator CADSI Communications and Data Systems Integration CADU Control and Display Unit CAE Common Application Environment CAE Computer-Aided Engineering CAIB Columbia Accident Investigation Board CAL Calibrate, Calibration CAL Cornell Aeronautical Laboratory cal Calories CALC Calculate CALIPSO Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation CAM Carrier Aircraft Modification CAM Centrifuge Accommodations Module CAM Computer Aided Manufacturing CAM Computer Annunciation Matrix CAM Content Addressable Memory CAMR Camera CAN Certification Analysis Network CAP Capacitor, Capacity CAP CCMS Application Programs CAP Computer Application Program CAP Contractor Acquired Property CAP Cost Account Package CAP Crew Activity Plan CAPCOM Capsule Communicator CAPPS Checkout, Assembly and Payload Processing Services CAPRI Captive Reset Igniter CAPS Common Attitude Pointing System CAPS Corrective Action Problem System CAPS Crew Activity Planning System CAPS Crew Altitude Protection Suit CAPSIM Captive Simulation CAR Certification Approval Request CAR Configuration and Acceptance Review CAR Corrective Action Request CARID Customer Acceptance Review Item Disposition CARR Customer Acceptance Readiness Review CAS Calibrated Airspeed CAS Command Augmentation System CAS Control Augmentation System CASE Computer Aided Software Engineering CASO Cancellation Addendum Sales Order CASP CDS Application Support Programs CASS CITE Augmentation Support System CATEG Category CAU Command Acquisition Unit CAU Command Activation Unit CAU Customer Acquisition Unit CAUSE Computer Aided User Oriented System Evaluation CAUT Caution CB Center of Buoyancy CB Circuit Breaker CB Constant Bandwidth CB/ac Circuit Breaker (ac only) CB/dc Circuit Breaker (dc only) CBA C-Band Transponder Antenna CBA Collective Bargaining Agreement CBACS Common Badging and Access Control System CBC Complete Blood Count CBE Connector Bracket, Experiment CBIL Common and Bulk Items List CBM Common Berthing Mechanism CBP Connector Bracket Power CBrF3 Bromotrifluoromethane (Fire-Extinguishing Material) CBS Connector Bracket Signal CBSA Cargo Bay Stowage Assembly CBV Cabin Bleed Valve CBW Constant Bandwidth CBX C-Band Transponder CC Carbon-Carbon CC Channel Controller CC Chief Counsel (KSC Directorate) CC Communications Control CC Cost Center CC Crew Compartment CC Crew(s) Certified CCA Communications Carrier Assembly CCA Contract Change Authorization CCA Coolant Control Assembly CCAFS Cape Canaveral Air Force Station CCAS Cape Canaveral Air Station CCATS Command, Communication, and Telemetry System CCB Configuration Change Board CCB Change Control Board CCB Configuration Control Board CCBD Configuration Control Board Directive CCC Central Communications Center CCC Central Computer Complex CCC Communication(s) Control Console CCC Complex Control Center CCC Contaminant Control Cartridge CCC Controller Checkout Console CCD Charge Coupled Device CCD Checkout Command Decoder CCD Constants Change Display CCDR Contractor Critical Design Review CCE Computer Command Engineer CCF Converter Compressor Facility CCFF Cape Canaveral Forecast Facility CCIR International Radio Consultative Committee CCL Closed Circuit Loop CCL Commonality Candidate List CCL Configuration Control Logic CCM Controlled Carrier Modulation CCM Crew/Cargo Module CCME Contract Change Mass Estimate CCMS Checkout, Control and Monitor System CCMS Checkout, Control, and Monitor Subsystem (LPS) CCMS Command Control and Monitor System CCN Contract Change Notice CCN Contract Change Negotiation CCOH Corrosive Contaminants, Oxygen, and Humidity CCP Center Console Panel CCP Configuration Control Phase CCP Commercial Change Proposal CCP Cost Control Program CCP Charge Capacitance Probe CCP Contract Change Proposal CCP Configuration Control Panel CCP Configuration Change Point CCP Computer Control Panel CCR Configuration Change Request CCR Contractor Change Request CCR Control Center Rack CCR Corner Cube Retroflectors CCRA Cape Canaveral Reference Atmosphere CCRF Consolidated Communication Recording Facility CCS Central Control Section CCS Central Control Station CCS Command and Communication System CCS Command and Control Subsystem CCS Complex Control Set CCS Computer Core Segment CCS Console Communication System CCS Contamination Control System CCSCS Consultive Committee for Space Data Systems CCSSO Council of Chief State School Officers CCT Computer Compatible Tape CCT Cost Committment Team CCTE Conditioned Cargo Transport Equipment CCTV Closed Circuit Television CCU Camera Control Unit CCU Central Control Unit CCU Communications Carrier Unit CCU Crewman Communications Umbilical CCV Chamber Coolant Valve CCVA Chamber Coolant Valve Actuator CCW Counterclockwise CCIM Command Computer Input Multiplexer CD Center Director (KSC Directorate) CD Change Directive CD Coefficient of Drag CD Command Decoder MDM CD Contractual Data cd Candella (Luminous Intensity) CDA Command and Data Acquisition CDA Critical Design Audit CDB Central Data Buffer CDB Command Data Base CDBFR Common Data Buffer CDC Confined Detonating Cord CDC Control Data Corporation CDC Countdown Clock CDCE Cosmic Dust Collection Experiment CDCR Contractor Drawing Change Request CDDF Center Director's Discretionary Fund CDDS Command and Data System CDDT Countdown Demonstration Test CDF Cable Distribution Frame CDF Central Data Facility CDF Circuit Design Fabrication CDF Confined Detonating Fuse CDF Cool-Down Facility CDF&TDS Circuit Design, Fabrication, and Test Data Systems CDH Constant Delta Height CDI Course Deviation Indicator CDM Communications/Data Manager CDMS Command and Data Management Subsystem CDMS Command and Data Management System CDN CDR Discrepancy Notice CDNB CDR Discrepancy Notice Board CDOS Customer Data and Operations System CDP Command Data Processor CDPIS Command Data Processing and Instrumentation System CDQR Critical Design and Qualification Review CDR Cleaning, Decontamination Request CDR Commander CDR Critical Design Review CDRL Contract Data Requirements List CDROM Compact Disk Read Only Memory CDRR Component Design Requirements Review CDRR Contract Documentation Requirements Records CDS Central Data Subsystems (LPS) CDS Central Data System CDS Closeout Door System CDS Collision Detector System CDS Control Data Corporation CDS Control Data System CDSC Communications Distribution and Switching Center CDT Central Daylight Time CDT Command Descriptor Table CDT Compressed Data Tape CDT Configuration Data Table CDT Countdown Time CDU Computer Display Unit CDU Control and Display Unit CDU Coupling Data Unit CDU Coupling Display Unit CDU CRT Display Unit CDW Command Data Word CDW Computer Data Word CE Change Evaluation CE Civil Engineering CE Control Element CE Cost Element CE Current Expendable CE&IS Combined Elements and Integration Systems CEA Control Electronics Assembly (for MMU) CEC Control Electronics Container CEC Control Encoder Coupler CECP Compatibility Engineering Change Proposal CEDC Cycling Error Detection Code CEI Configuration End Item CEI Contract End Item CEIAC Coastal Engineering Information Analysis Center CEIT Crew Equipment Integration Test CEIT Crew Equipment Interface Test CELSS Controlled Environment and Life Support System CELV Complementary Expendable Launch Vehicle CEP Circular Error Probable CEQ Council on Environmental Quality CER Cost Estimating Relationship CERT Certification CERV Crew Emergency Return Vehicle CES Control Electronics System CES Crew Escape System CESC Canadian Space Agency Engineering Support Center CETA Crew and Equipment Translation Aid CETF Critical Evaluation Task Force CEU Control Electronics Unit CEV Crew Exploration Vehicle CF Carrier Frequency CF Center Forward CF Centrifugal Force CFD Computational Fluid Dynamics CFD Continuous Flow Diffusion CFD Converter, Frequency to dc Voltage CFE Contractor Furnished Equipment CFES Continuous Flow Electrophoresis System CFI Card Format Identifier CFLSE Critical Fluid Light Scattering Experiment CFM Customer Furnished Material CFM Cubic Feet per Minute CFMF Crip Flow Management Facility CFP Conceptual Flight Profile CFR Code of Federal Regulation CFRP Carbon Fiber Reinforced Plastics CFSTI Clearinghouse for Scientific and Technical Information (now NTIS) CFT Common Facilities Test CFU Colony Forming Unit CFY Company Fiscal Year CG Center of Gravity CGAU Cabin Gas Analysis Unit CGC Command Guidance Computer CGCD Crossed Grid Charge Detector CGF Crystal Growth Furnace CGG Contingency Gravity Gradient CGP Central Grounding Point CGSS Cryogenic Gas Storage Subsystem CH Channel CH4 Methane CHAMP Comet Halley Active Monitoring Program CHAN Channel CHAR Character CHASE Coronal Helium Abundance Spacelab Experiment CHCS Cabin Humidity Control Subsystem CHeCS Crew Health Care System CHG Change CHG Charge CHGR Charger CHL Certified Hardware List CHL Channel CHMBR Chamber CHR Cooper-Harper Rating CHROMEX Chromosome and Plant Cell Division in Space CHS Collimated Hole Structure CHUTE Parachute CHX Cabin Heat Exchanger CI Certification Inspection CI Color Interior Film CI Configuration Inspection CI Configuration Item CI Continuous Interlock CI Course (deviation display) Invalid CI Crew Interface CIA Control Interface Assembly CIAP Climatic Impact Assessment Program CIAR Change Implementation/Assessment Record CIB Change Impact Board CIB Change Implementation Board CIC Command Interface Control CIC Communications Interface Coordinator CIC Continuing Improvement Council CIC Control and Information Center CIC Crew Interface Coordinator CICA Competition in Contracting Act CICC Cargo Integration Control Center CICU Computer Interface Conditioning Unit CICU Computer Interface Control Unit CID Charge Injection Device CID Computer Interface Device CIDL Configuration Item Data List CIDR Critical Intermediate Design Review CIE Communications Interface Equipment CIE Computer Interface Electronics CIF Central Instrumentation Facility CIFS Critical Initial Flaw Size CIG Cable Integrity Group CIG Communications and Interface Group CIL Critical Items List CIM Computer Input Multiplexer CIMS Cyber Identity Management System CIN Center Information Network CIN Change Identification Number CINDAS Center for Information and Numerical Data Analysis and Synthesis CIO Chief Information Officer CIP Coordinated Instrument Package CIP Customer Integration Panel CIR Cargo Integration Review CIR Change Incorporation Record CIR Circle CIR Circulate CIR Configuration Inspection Report CIRC Circularization Burn, OMS2 CIRCUM Circumference CIRHS Critical Items and Residual Hazards List CIRRIS Cryogenic Infrared Radiance Instrument for Shuttle CIS Center for Internet Security CIS Central Integration Site CIS Change Impact Summary CIS Communication Interface System CIS Component Identification Sheet CIS Contractor's Information Submittal CIS Customer Information System CISS Centaur Integrated Support Structure CIT Critical Item Tag CITE Cargo Integration Test Equipment CIU Communications Interface Unit CIU Computer Interface Unit CIU Controller Interface Unit CIV Critical Ionization Velocity CIVT Cargo Interface Verification Test CJC Cold Junction Compensator CK Check CKAFS Cape Kennedy Air Force Station (Changed to CCAFS) CKPT Checkpoint CKRA Cape Kennedy Reference Atmosphere (Changed to CCRA) CKS Checks CKT Circuit CL Centerline CL Close (Closed) CL Closed Loop CL Closed Loop Control Logic CL Cluster CL Coefficient of Lift CL Commonality List Class Classification CLC Change Letter Control CLC Critical Load Cycle CLCS Checkout and Launch Control System CLDST Closed Loop Dynamic Stability Test CLG Ceiling CLIN Contact Line Item Number CLIP Combined Laser Instrumentation Package CLM Care Logic Module CLMC Central Logistics Management Center CLN Change Leaders Network CLNR Cleaner CLOC Canadian Logistics Operation Center CLR Clear CLRB Cost Limit Review Board CLS Contingency Landing Site(s) CLSO Contingency Landing Support Officer CLT Closed Loop Test CLUSTER International Solar Terrestrial Physics Program CLV Crew Launch Vehicle CM Cargo Management CM Center of Mass CM Common Module CM Configuration Management CM Consumables Management CM Control Monitor CM Crew Module cm Centimeter CM&S Communications Maintenance and Storage CMA Configuration Management Accounting CMA Cylindrical Mirror Assembly CMACS Central Monitor and Control System CMAO Contract Management Assistance Officer CMAT Compatible Materials (List) CMC Command Module Computer CMC Crew Module Computer CMD Command CMD Contamination Monitor Package CMD DCDR Command Decoder CMG Control Moment Gyroscope CMM Condition Monitored Maintenance CMN Crewman CMO Configuration Management Office CMOS Complementary Metal Oxide Silicon CMP Configuration Management Plan CMPR Compare CMPRT Compartment CMPTD Computed CMPTR Computer CMPTR ACTY Computer Activity CMR Center Materials Representative CMRB Contractor Material Review Board CMRR Common Mode Rejection Ratio CMS Competency Management System CMS-2 Cambridge Monitoring System (IBM Computer Program) CMSI Checkout/Control and Monitor Subsystem Interface CMTS Computerized Maintenance Test System CMV Common Mode Voltage CN Change Notice CNDS Condensate CNRL Communications and Navigation Research Laboratory CNSL Console CNTL Control CNTR Counter CNTRL Control CNTRL Controller CNWDI Critical Nuclear Weapons Design Information CO Carbon Monoxide CO Cargo Operations (KSC Directorate) CO Change Order CO Contracting Officer CO Cutoff CO2 Carbon Dioxide COA Center Operations Area COAS Course Optical Alignment Sight COAS Crew(man) Optical Alignment Sight COAS Crewman optical alignment sight COAX Coaxial, Coaxial Cable COB Communications Office Building COBE Cosmic Background Explorer COBOL Common Business Oriented Language COC Close-Open-Close COD Center Operations Directorate (JSC) COE Corps of Engineers COF Central Operations Facility COF Columbus Orbital Facility CoF Construction of Facilities C of F Construction of Facilities C of F Cost of Facilities COFI Checkout and Fault Isolation (on Board) COFR Certificate of Flight Readiness COFW Certificate of Flight Worthiness COI Coast Orbital Insertion COI Composite Optics, Inc. COIM Checkout Interpreter (Software) Module COL Checkout Language COL Coast Orbital Insertion COLD-SAT Cryogenic on Orbit Liquid Depot-Storage, Acquisition, Transfer COLM Column COM Common, Commonality COM Computer Output Microfiche COM-M Common Mode COMAS Combined Orbital Maneuvering and Abort System COMAT Compatibility of Materials COMB Combustion COMEC Communications Security COMEDS Continental U.S. Meteorological Data System COMM Communications COMMAND Computer Command Engineer COMP Compass COMP Compensate COMP Component COMP Computation of Rendezvous Targeting COMP Computer COMPEN Compensator COMPL Completed COMPOOL Common Data Pool COMPR Compress, Compressor COMPT Compartment COMR&DSAT Communication Research and Development Satellite COMSAT Communications Satellite COMSEC Communications Security COMTEL Compton Telescope CON Contact CONCN Concentration COND Condenser COND Condition, Conditioner CONDR Conditioner CONF Conference CONFIG Configuration CONN Connect, Connector CONS Console CONSTR Construct, Construction CONT Container CONT Contingency CONT Continue, Continued, Continuous CONTAM Contaminate CONTIG Contiguous CONTR Control, Controller CONUS Continental United States CONV Converter COOP Cooperative COORD Coordinate COP Contingency Operations Plan COP Co-orbiting Platform COPV Composite Overwrapped Pressure Vessel COQ Certificate of Qualification COR Contracting Officer Representative CORE Common Operational Research Equipment COS Carry-on Oxygen System COS Console Operating System COS Co-orbiting Satellite COS Cosine COSATI Committee on Scientific and Technical Information COSI Closeout System Installation COSMIC Coherent Optical System of Modular Imaging Collectors COSPAR Committee on Space Research COSS Centaur Operations at the Space Station COSTA Cost Accounting (Code) COTR Contracting Officer's Technical Representative COTS Commercial Off the Shelf COV Cutoff Valve CP Candle Power CP Cargo Program Office (KSC) CP Cargo Projects Office (KSC) CP Center of Pressure CP Chemically Pure CP Circular Pitch CP Cold Plate CP Console Processor CP Control Panel CP Control Point CP-DPO Deployable Payloads Projects Office (KSC) CP-FEO Cargo Facilities and GSE Projects Office (KSC) CP-PCO Cargo Projects-Program Control Office CP-SPO Spacelab Projects Office (KSC) CPA Contingency Planning Aid CPA Critical Path Analysis CPAF Cost Plus Award Fee CPC Central Planning Center CPC Characteristics Properties Code CPC Computer Program Component CPCB Crew Procedures Control Board CPCEI Computer Program Contract End Item CPCI Computer Program Change Instruction CPCI Computer Program Configuration Item CPCL Computer Program Change Library CPCL Computer Program Control Library CPCR Computer Program Change Request CPCR Crew Procedures Change Request (Form 482) CPD Converter, Pulse to dc Voltage CPD Crew Passive Dosimeter CPD Crew Procedures Division CPDDS Computer Program Detail Design Specification CPDR Contractor's Preliminary Design Review CPDS Computer Program Design (or Development) Specification CPDS Crew Procedures Documentation System CPE Change Package Engineer CPE Chief Program Engineer CPE Continuous Particle Electrophoresis CPEI Computer Program End Item CPES Crew Procedures Evaluation (Evaluator) Simulator CPF Cargo Processing Facility CPF Central Processing Facility CPF Cost Per Flight CPFF Cost Plus Fixed Fee CPG Change Planning Group CPI Cost Performance Index CPI Cross Pointer Indicator CPIF Cost Plus Incentive Fee CPL Capillary Pump Loop CPL Couple CPLT Complete CPM Computer Program Module CPM Critical Path Method CPM Cycles per Minute CPMP Crew Procedures Management Plan CPP Competitive Placement Plan CPR Critical Problem Report CPS Canadian Payload Specialist CPS Cycles Per Second CPSE Common Payload Support Equipment CPSS Cold Plate Support Structure CPSS Critical Phase System Software CPT Cargo Processing Technician CPT Computer Program Tapes CPU Central Processing Unit CPU Computer Printer Unit CQCM Cryogenic Quartz Crystal Microbalance CQDR Critical Qualification Design Review CR Card Reader CR Certification Requirement CR Change Request CR Configuration Review CR Control Room CR Crew CR&T Command, Ranging, and Telemetry CR/DIR Change Request Directive CRAF Comet Rendezvous Asteroid Flyby CRAS Cost Reduction Alternative Study CRB Change Review Board CRBD Change Review Board Directive CRC Contractor Recommended Code CRC Cost Reduction Curve CRD Change Request Disposition CRDG Contamination Requirements Definition Group CRDP Computer Resources Development Plan CRES Corrosion Resistant Steel CRG Change Review Group CRG Correspondence Review Group CRIS Calibration Recall and Information System CRISP Computer Resources Integrated Support Plan CRIT Critical CRM Chemical Release Module CRMD Computer Resources Management Data CRN Cable Routing Rotation CRN Contract Revision Number CRO Cathode Ray Oscillograph(s) or Oscilloscopes CRP Configuration Requirements Processing CRPL Cosmic Ray Physics Laboratory CRR Computer Run Report CRR Critical Requirements Review CRS CO2 Reduction Subsystem CRS Course CRS Cross CRSFD Crossfeed CRSI Ceramic Reusable Surface Insulation CRSVR Crossover CRT Cathode-Ray Tube CRTG Cartridge CRW Control Read/Write CRYO Cryogenic CRYT Cryogen Tank CS Change Status CS Checkout Station CS Clean Sheet CS Common Set CS Communications System CS Consumables Status CS Control Segment CS Core Segment CS Crew Station CS Spacelab Operations Directorate CS STS Cargo Operations (KSC Directorate) CSA Canadian Space Agency CSA Cyclic Strain Attenuator CSAA Committee on Space Astronomy and Astrophysics CSAM Crinkled Single Aluminized Mylar CSAS Computerized Status Accounting System CSAT Combined Systems Acceptance Test CSC Computer Sciences Corporation CSC Conical Shaped Charge CSC Contingency Support Center (CCAFS) CSC Cosecant Computing Amplifier CSCB Contractor's Summary Cost Breakdown CSCSAT Commercial Synchronous Communication Satellite CSD Chemical Systems Division CSD Control System Development CSD Crew Systems Division CSDD Control Systems Development Division (JSC) CSDF Central Source Data File CSDL Charles Stark Draper Laboratory (MIT) CSDT Computer Software Data Tapes CSE Catalytic Surface Effects Experiment CSE Common Support Equipment CSE Communications Systems Engineer CSE Computer Support Equipment CSE Configuration Switching Equipment CSF Central Supply Facility CSF Cost Sensitivity Factor CSI Coelliptic Sequence Initiation CSI Control Servo Input CSI Controls-Structures Interactions CSI Crew Software Interface CSIR Computer Systems (Hardware/Software) Integration Review CSIU Core Segment Interface Unit CSL Command Signal Limiter CSL Computer Status Lights CSL Crew Systems Laboratory CSM Command Service Module CSM Common Support Module CSM Computer Status Matrix CSOC Consolidated Space Operations Center CSOP Crew Systems Operating Procedures CSP Computer Support Program CSPU Core Segment Processing Unit CSR Certification Status Report CSR Check Signal Return CSR Crew Station Review CSRP Computers and Software Review Panel CSS Computer Subsystem CSS Control Stick Steering CSS Core Segment Simulator CSSA Coarse Sun Sensor Assembly CSSE Control System Simulation Equipment CST Central Standard Time CST Combined Systems Test CST Contract Supplemental Tooling CST Crew Station Trainer CST Crew Systems Trainer (One-G Trainer) CSTA Crew Software Training Aid CSTR Canister CSTS Cryogenic Storage and Transfer System CT Crawler Transporter CT Current Transformer CTA Computer Technology Associates (GSFC) CTA Controlled Thrust Assembly CTC Camera, Timing, and Control CTC Chief Test Conductor CTC Core Technical Capabilities CTE Central Timing Equipment CTI Critical Transportation Item CTIS Crawler Transporter Intercom System CTL Central or Control CTL Canoga Test Laboratory CTM Crystalline Transitional Material CTM Contract Technical Manager CTN Certification Test Network CTP Cyclic Time Processor CTP Communications Timing Procedure CTPD Crew Training and Procedures Division (JSC) CTR Contract Technical Representative CTRS Component Test Requirements Specifications CTS Canadian Technology Satellite CTS Communications and Tracking System CTS Computer Test Set CTS Computerized Training System CTSD Computer Test Sequences Document CTSD Coordinate Transformation System CTTB Checkout Techniques Test Bed CTU Central Timing Unit CTWT Counterweight CU Control Unit cu Cubic CUB Commonality Usage Board CUC Computer Usage Control CUDS Cumulative Data Statistics CUE Common Usage Equipment CUF Cross Utilization File CUIL Common Usage Item List CUM Cumulative CUP Commonality Usage Proposal CV Check Valve CV Coefficient of Variation CV Deployable Payloads Operation (KSC CO Dir.) CV Expendable Vehicles Operations (KSC Directorate) CVAD Converter, Voltage, ac to dc CVAS Configuration Verification Accounting System CVDA Converter, Voltage Discrete, ac CVE Complete Vehicle Erector CVM Control Valve Module CVR Change Verification Record CVR Configuration Verification Review CVRD Converter, Variable Resistance, to dc Voltage CVT Communications Vector Table CVT Concept Verification Testing CW Clockwise CW Command Word CW Continuous Wave CWA Caution and Warning Annunciator CWA Clean Work Area CWA Controlled Work Area CWE Caution and Warning Electronics CWEA Caution and Warning Electronic Assembly CWEU Caution and Warning Electronics Unit CWFSP Caution and Warning/Fire Suppression Panel CWG Constant Wear Garment CWLM Caution and Warning Limit Module CWS Caution and Warning Status CWS Caution and Warning System CWSU Caution and Warning Status Unit CWSU Condensate Water Servicing Unit CX Color Exterior Film CY Calendar Year CY Cycle CYL Cylinder D D Deck D Deliver (Delivery) D Delta D Down D Drag D&C Display and Control (C&D preferred) D&CS Display and Controls Subsystem D&O Description and Operations D&P Drain and Purge D&PD Definition and Preliminary Design D&PS Design and Performance Specification D&R Definition and Requirement D/A Digital to Analog D/C Displays/Controls D/L Data Link D/L Deorbit/Landing D/L Downlink D/L Downlist D/S Downstream D/VD Data/Voice Data DA Data Acquisition DA Deployment Assembly DA Distribution Assembly DA Double Amplitude DA&D Data Acquisition and Distribution DAAWG Disability Awareness and Action Working Group DAB Data Acquisition Bus DABS Discrete Address Beacon System DAC Data Acquisition and Control DAC Data Acquisition Camera DAC Digital to Analog Converter DAC Digital to Analytical Conversion DACB Data Acquisition and Control Buffer DACBU Data Acquisition and Control Buffer Unit DACS Data Acquisition and Control System DACS Digital Acquisition and Control System DACT Disposable Absorption Collection Trunk DADE Data Acquisition and Decommutation Equipment DADS Dual Air Density Satellite DAE Data Acquisition Equipment DAF Data Acquisition Facility DAF Data Analysis Facility DAFT Data Acquisition Frequency Table DAIS Data Avionics Information System DAIU Docked Audio Interface Unit DAL Data Accession List DAL Data Acquisition List DAL Data Aided Loop DAM Double Aluminized Mylar DAM Driver Amplifier Module DAP Data Acquisition Plan DAP Data Analysis and Presentation DAP Digital Autopilot DAR Data Aided Receiver DAR Deviation Approval Request DAR Digital Autopilot Requirements DAR Drawing Analysis Record DARPA Defense Advanced Research Projects Agency DARS Data Acquisition and Reduction System DART Days Away, Restricted and Transferred DART Demonstration of Autonomous Rendezvous Technology DARTS Digital Automated Radar Tracking System DAS Data Acquisition System DAS Data Analysis Station DAS Digital Address System DAS Digital Avionics System DAS Documentation Accountability Sheet DASA Dual Aerosurface Servo Amplifier DATE Dynamics, Acoustics, and Thermal Environment DAU Data Acquisition Unit DAU Digital Adapter Unit DAV Data Available DAVL Data Available-Low DB Data Base DB Data Bus DB Deadband DB Design Baseline DB Distribution Box DB Dry Bulb dB Decibel DBC Data Bus Control DBC Data Bus Coupler DBCI DB with Respect to a Circular Polarized Antenna DBE Data Bus Element DBFN Data Bus File Number DBFN Data Base File Number DBG Data Bus Group DBL Double DBGMP Data Bus Generation and Maintenance Package DBIA Data Bus Interface Adapter DBIA Data Bus Isolation Amplifier DBIU Data Bus Interface Unit DBS Data Base System dBM Decibels Referred to 1 Milliwatt DBN Data Bus Network DBP Design Baseline Program DBRN Data Bank Release Notice DBM Data Base Management DBW Data Bus Wire dBW Decibels Referred to 1 Watt DBUR Data Bank Update Request DBIA Data Bus Isolation Amplifier DBN Data Bus Network DC Data Coordinator DC Development-Center DC Display Coupler dc Direct Current DCA Defense Communication Agency DCA Design Change Authorization DCA Digital Command Assembly DCA Distribution Control Agency DCAA Defense Contract Audit Agency DCAR Design Corrective Action Report DCAS Data Collection and Analysis System DCAS Defense Contract Administration Services DCC Data Computation Complex DCC Document Control Center DCCU Digital Command and Control Unit DCCU Digital Communications and Control Unit DCCU Display Computer Control Unit DCE Drop Combustion Experiment DCIB Data Communication Input Buffer DCIM/DSCIM Display System Computer Input Multiplexer DCIU Digital Control and Interface Unit DCKNG Docking DCL Document Change List DCM Direction Cosine Matrix DCM DECOM Control Memory DCM Display and Control Module DCMB Development Configuration Management Board DCN Design Change Notice DCN Document Change Notice DCN Drawing Change Notice DCNP Document Change Notice Proposal DCO Detailed Checkout DCOP Detailed Checkout Procedures DCOP Displays, Controls, and Operations Procedures DCP Data Collection Platform DCP Depot Condemnation Percent DCP DEU Control Program DCP Development Cost Plan DCPEI DEU Control Program End Item DCR Design Change Request DCR Design Certification Review DCR Document Change Record (or Review) DCR Design Concern Report DCS Data Communication System DCS Data Control System DCS Design Communication System DCS Design Criteria Specification DCS Detail Checkout Specification(s) DCS Digital Command System (Subsystem) DCS Display and Control System DCS Document Control System DCS Dual Checkout Station DCSI Data and Control Signal Interface DCSP Digital Control Signal Processor DCSU Digital Computer Switching Unit DCU Digital Computer Unit DCU Display and Control Unit DCV Direct Current Volts DD Data Depository DD Mechanical and Facilities Engineering (KSC DE Dir.) DD Directives Documentation DD Dedicated Displays DD Data Display DD Decoder Driver DD&CS Dedicated Display and Control Subsystem DD/HH:MM:SS Day/Hour:Minute:Second DDA Digital Differential Analyzer DDA ICD Departure Authorization DDAS Digital Data Acquisition System DDC Defense Documentation Center DDC Data Distribution Center DDC Digital Data Cell DDCU Dc to DC Converter Unit DDD Display Decoder Drive DDD Design Definition Document DDDL Digital Data Downlink DDDU Digital Decoder Driver Unit DDI Dedicated Display Indicator DDI Discrete Data input DDI Discrete Digital Input DDIS Data Depository Index System DDL Data Downlink DDM Data Display Module DDM Data Display Monitoring DDM Discrete Data Management DDMS DOD Manager for Space Shuttle Support DDO Discrete Digital Output DDP Design Development Plan DDP Digital Data Processing (Processor) DDPC Digital Data Processing Center (Complex) DDPF Dedicated Display Processing Function DDPS Digital Data Processing System DDR Data Discrepancy Report DDR Design Development Record DDR Detail Design Review DDS Documentation Distribution System DDS Data Display System DDS Detailed Design Specification DDT&E Design, Development, Test, and Engineering/Evaluation DDT&E Design, Development, Test, and Evaluation DDTF Dynamic Docking Test Facility DDTS Dynamic Docking Test System DDU Decommutator Distribution Unit DDU Data Display Unit DDU Display Driver Unit DE Design Engineering (KSC Dir.) DE Doppler Extractor DE Dynamics Explorer DEA Deployed electronics assembly DEACT Deactivate DEC Declination DECL Direct Energy Conversion Laboratory (JSC) DECOM Decommutate, Decommutator DECR Decrease DECS Civil Engineering Office at Vandenberg DECU Data Exchange Control Unit DED Dedicate, Dedicated DEDA Data Entry and Display Assembly DEE Digital Events Evaluator DEF Definition DEFL Deflect DEG Degree DEI Design Engineering Identification DEIS Design Engineering Inspection Simulation DEIS Design Evaluation Inspection Simulator DEL Deliver, Delivery DEL Deorbit, Entry, and Landing DELTA-T Difference in Temperature DEMOD Demodulate, Demodulator DEMUX Demultiplexer DEORB Deorbit DEPL Deploy DEPRESS Depressurize DEPT Department DER Drawing Error Report DERIGID Derigidize DES Data Exchange System DES Descend, Descent DESAT Desaturated DESC Descent DESIG Designate DESPOT Design Performance Optimization DEST Destination DET Detent DET Detail DETN Detection DETR Detector DEU Display Electronic(s) Unit DEV Develop, Development DEVN Deviation DEW Distant Early Warning DF Development Flight DF Development-Forward DF Direction Finder (Finding) DF Disassembly Facility DF Display Functions DF-SPE-A Shuttle Project Engineering Office DFCS Digital Flight Control Software (System) DFE Data Flow Engineer DFE Direction Finding Equipment DFG Display Format Generator DFI Development Flight Instrumentation DFR Defrost DFRC Hugh L. Dryden Flight Research Center DFRF Dryden Flight Research Facility DFRN Differential DFRN PRESS Differential Pressure DFS Directional Finding System DFS Dynamic Flight Simulator DFVLR Deutsche Forschungs-und Versuchsanstalt Luft-und Raumfahrt Federal German Aerospace Research Establishment DG Display Generator DH Decision Height DHA Design Hazards Analysis DHE Data Handling Electronics DHS Discrete Horizon Sensor DI Data Integrator DI Development Integration DI Discrete Input DI Display Interface DI Display Interface Processor (Software Functional Element) DIA Diameter DIAG Diagonal DIAGN Diagnose DIDS Defense Integrated Data System DIF Difference DIF Discrete Increment Filter DIFF Differential DIGI Digital DIH Discrete Input High DIL Deliverable Items List DIL Discrete Input Low DIM Design Interface Meeting DIMEN Dimension DIP Designated Inspection Point DIP Display Input Processor DIP Display Interface Processing (Processor) DIPEC Defense Industrial Plant Equipment Center DIPL Display Initial Program Load DIR Direct DIR Document Information Record DIS Documentation Index System DIS Disagree DISAP Disapproved DISASSY Disassembly DISC Discone DISC Disconnect DISC Discrete DISCH Discharge DISENG Disengage DISP Dispenser DISP Display DIST Distribution DIT Dynamic Integrated Test DIU Data Interface Unit DIU Digital Interface Unit DIV Division DIT Data ID Table DIT Dynamic Integrated Test DISTR Distributor DK Deck DK Display/Keyboard DK Docking DL Development-Left DL Downlink DL Electronics Engineering (KSC DE Dir.) DLAT Destructive Lot Acceptance Testing DLC Direct Lift Control DLS Dynamic Load Simulator DLSC Defense Logistics Service Center DLSM Data Link Summary Message DLTR Data Link Terminal Repeater DLTR Data Link Transmission Repeater DLY Delay DM Data Manager DM Development Motor DM Developmental Instrumentation MDM-Mid DM Disassembly Manual DM Docking Mechanism DM Document, Documentation DMA Direct Memory Access DMA Direct Memory Address DMC Data Management Computer DMC Direct Maintenance Cost DMC Drive Motor Assembly DMCF Deservicing, Maintenance, and Checkout Facility DMD Dextrous Manipulator Demonstration DME Distance Measuring Equipment DMG Data Management Group DMIA Dual Multiplexer Interface Adapter DMIS Data Management Information System DML Developmental Instrumentation MDM-Left DMON Discrete Monitoring DMP Deployable Maintenance Platform DMP DEU Message Processor DMP Dump DMR Developmental Instrumentation MDM-Right DMS Data Management System DMS Docking Mechanism System (Subsystem) DMS Docking Module Subsystem DMS Dynamic Motion Simulator DMSS Data Management System Simulator (CVT) DN Discrepancy Notice DN Down DNA Does Not Apply DNLK Downlink (D/L preferred) DNLT Downlist DNO Descending Node Orbit DNP Dynamic Nuclear Polarization DO Discrete Output DOA Department of Agriculture DOC Department of Commerce DOC Document, Documentation DOD Department of Defense DOD-STP Department of Defense-Standard Satellite DODD Department of Defense Directive DOE Department of Energy DOF Degree-of-Freedom DOF Direction of Flight DOH Discrete Output High DOI Descent Orbit Insertion DOL Department of Labor DOL Discrete Output Low DOMSAT Domestic Satellite DOP Diver Operated Plug DOS Disk Operating System DOSIM Dosimeter DOT Department of Transportation DOT Deployment Operations Team DOT/CIAP DOT Climatic Impact Assessment Program DOY Day of Year DP Data Processing DP Delayed Procurement DP Deployable Payload DP Design Proof DP Development Phase DP Differential Pressure DP Double Pole DP Double Precision DP&S Data Processing and Software DP&SS Data Processing and Software Subsystem DP/DT Delta Pressure/Delta Time DPA Data Processing Assembly DPAF Dual Payload Attachment Fitting DPI Detail Program Interrelationships DPLR Doppler DPM Dual Port Memory DPNL Distribution Panel DPP Deployment Pointing Panels DPR Definition Phase Review DPS Data Processing and Software DPS Data Processing Software System DPS Data Processing System (Subsystern) DPT Design Proof Test DPY Deploy DR Dead Reckoning DR Design Review DR Development-Right DR Discrepancy Report DR Discrete Register DR Dispatch Reliability DR Disposition Record DR Door DR Drive DR&A Data Requirements and Analysis DRA Data Release Authorization DRB Design Requirements Baseline DRB Design Review Board DRC Data Reduction Center DRC Discrete Rate Command DRD Data Requirement Description DRD Data Requirements Document DRD Detailed Requirements Document DRD Document Requirement Description DRF Data Request Form DRF Digital, Radio Frequency DRF Documentation Requisition Form DRG Digital Ranging Generator DRI Data Rate Indicator DRIRU Dry Rotor Inertial Reference Unit DRK Display Request Keyboard DRL Data Requirements List DRL Document Requirements List DRM Data Records Management DRM Design Reference Mission DRM Drawing Requirements Manual DRN Drain DRO Document Release Order DROG Drogue DRR Data Recorder/Reproducer DRR Design Requirements Review DRS Data Relay Satellite DRS Data Relay Station DRS Digital Range Safety DRSS Discrepancy Report Squawk Sheet DRT Design Reference Timeline DRTT Discrepancy Report Tracking Tool DRUC Disposition Record Unsatisfactory Condition DS Data Storage DS&R Data Storage and Retrieval DSA Defense Supply Agency DSAD Data Systems and Analysis Directorate (JSC) DSB Document Status Bulletin DSB Double Side Band DSC Data Separator Card DSC Dedicated Signal Conditioner DSN Deep-Space Network DTO Development Test Objective DTP Detail Test Plan DTPR Detailed Test Procedures DTRD Development Test Requirements Document DTS Data Transmission System DTS Data Transfer System DU Display Unit DUA Digital Uplink Assembly DUC Digital Uplink Command DUM Dummy DUPLX Duplex DUPLXR Duplexer DUR Duration DV Designated Verification DV Designee for Verification DV Differential Velocity DVD Delta Velocity Display DVM Digital Voltmeter DVS Design Verification Specification DVS Digital Voice System DVT Design Verification Testing DVT Development Verification Test DW Data Word DWG Drawing DWI Data Word In DWS Disaster Warning Satellite DWV Dielectric Withstanding Voltage DY Deputy Director (KSC Directorate) DYN Dynamic DXS Diffuse X-Ray Spectrometer E E East E Elevation Angle E Engine E Exempt (From Traceability) E&D Engineering and Development E&D Engineering and Development Directorate (JSC) E&I Electrical and Instrumentation E&OO Engineering and Operations Office E-E End-to-End E-MUX Electrical Multiplex E-P Electron/Proton E/C Encoder/Coupler E/L Entry/Landing E/M Engineering Model E/O Engineering/Operations E/O-IMS E/O-Information Management System E/W Energy to Weight Ratio E/W Energy Over Weight EA Each EA Electronic Assembly EA Elevation Angle EAC Energy Absorbing Capacity EAC Estimate at Completion EAC Experiment Apparatus Container EAD Electrically Alterable Device EADI Electronic Attitude Director Indicator EADS Engineering Analysis and Data System EAFB Edwards Air Force Base EAFB Eglin Air Force Base EAFB Ellington Air Force Base EAM Electrical Accounting Machine EAP Educator Astronaut Program EAP Employee Assistance Program EAR Engineering Analysis Report EAS Equivalent Air Speed EAT Environmental Acceptance Test EB Electronic Beam EB Emergency Box EBC Emulated Buffer Computer EBCDC Extended Binary Coded Decimal EBD Eyeballs Down (+GZ) EBI Eyeballs In (+GX) EBL Eyeballs Left (+GY) EBO Eyeballs Out (-GX) EBR Eyeballs Right (-GY) EBS Emergency Breathing Subsystem EBU Eyeballs Up (-GZ) EBW Electron Beam Welding EBW Exploding Bridge Wire EC Element Contractor EC Engine Control EC Engine Cutoff EC Essentiality Code EC Events Controller EC Events Coupler EC Experiment Computer ECA Electronics Control Assembly ECA Engineering Change Analysis ECA Epoxy Curing Agent ECAS Experiment Computer Application Software ECB Engineering Change Board ECB Event Control Block ECB Events Control Buffer ECC Engineering Change Control ECC Engineering Critical Component ECCB Engineering Change Control Board ECD Engineering Control Drawing ECD Estimated Completion Date ECEP Experiment Checkout Equipment Processor ECF Element Charge Factor ECF Equivalency Capability File ECG Electrocardiogram ECG Electrocardiograph ECI Earth Centered Inertia (inertials) ECIO Experiment Computer Input/Output ECL Entry Closed Loop ECLS Environmental Control and Life Support ECLSS Environmental Control and Life Support System (Subsystem) ECN Engineering Change Notice ECO Engine Combustion ECO Engine Cutoff ECO Engineering Change Order ECOS Experiment Computer Operating System ECP Engineering Change Program ECP Engineering Change Proposal ECP Engineering Control Proposal ECP Explicitly Coded Program ECR Engineering Change Request ECRA Engineering Change Request/Authorization ECS Engine Control System ECS Environmental Control System (Subsystem) ECU Electrical Control Unit ECU Electronic Coupling Unit ECU Environmental Control Unit ECU Experiment Control Unit ED Edge Distance ED Edit ED Engineering Directive ED Explosive Device EDA Electronic Display Assembly EDA Elevation Drive Assembly EDAX Compositional Analysis EDB Environmental Data Book EDC Engineering Design Change EDC(M) Electrochemical Depolarized CO2 (Module) EDCP Engineering Design Change Proposal EDDR Electron Dipole-Dipole Reservoir EDF Engineering Data File EDLN Engineering Development Logic Network EDM Electro-Discharge Machining EDMS Enterprise Document Management System EDNi Electro-Deposit Nickel EDO Extended Duration Orbiter EDP Electonic Data Processing EDP Embedded Data Processor EDPE Electronic Data Processing Equipment EDPM Electronic Data Processing Machine EDR Engineering Design Review EDS Electrical Distribution System EDS Emergency Detection System EDS Explosive Device System EDT Eastern Daylight Time EDU Engineering Development Unit EDV Electronic Depressurizing Valve EDW Edwards (TACAN Station) EDW Edwards Air Force Base, CA (Deorb OPT site) EE End Effector EEC Extendible Exit Cone EECOM Electrical, Environmental, and Communications EECOM Electrical, Environmental, Consumables, and Mechanical Systems (MPSR) EED Electro (Electrical) Explosive Device EED Electroexplosive device EEE Electronic, Electrical, Electromechanical EEEU End Effector Electronics Unit EEG Electroencephalogram EEH EMU Electrical Harness EEIS End-to-End Information System EEL Electrical Equipment List EEM Earth Entry Module EENT Eye, Ear, Nose, and Throat EES Ejection Escape Suit EES Emergency Ejection Suits EES Escape Ejection Suit EET Entry Elapsed Time EETB Electronic Electrical Termination Building EEVT Electrophoresis Equipment Verification Test EFA Experiment Flight Applications EFCS Earth Fixed Coordinate System EFF Efficiency EFFGRO Efficient Growth (Computer Program) EFP ESA Furnished Property EFTO Encrypted for Transmission Only EG Entry Guidance EGA Evolved Gas Analysis EGC Experiments Ground Computer EGF Electrical, Grapple Fixture EGIL Electrical, General Instrumentation, and Lighting Engineer EGRET Energetic Gamma Ray Explorer Telescope EGRS Egress EGSE Electrical Ground Support Equipment EGT Elapsed Ground Time EGT Estimated Ground Time EGT Exhaust Gas Temperature EGUN Fast Pulse Electron Gun EH/M Extension Hose/Mouthpiece EHC Electrical Heating Control EHF Extremely High Frequency EHOT External Hydrogen/Oxygen Tank EHP Effective Horsepower EHP Electrical Horsepower EHR Earned Hour Ratio EHS Enhanced HOSC System EHS Environmental Health Services EHX Experiment Dedicated Heat Exchanger EI Electromagnetic Interference EI Electronic Interface EI End Item EI Engineering Instruction EI Entry Interface EI Environmental Impact EIA Electrical Industries Association EIASN End Item Assembly Sequence Number EIC Experimental Intercom EID End Item Documentation EIDP End Item Data Package EIFA Element Interface Functional Analysis EIR Environmental Impact Report EIRP Effective Isotropic Radiated Power EIS Electrical Integration System EIS End Item Specification EIS Environmental Impact Statement EIS Extended Instruction Set EIT Entry Interface Time EIU Engine Interface Unit EIVT Electrical and Instrumentation Verification Test EIVT Electrical Interface Verification Test EIVT Electronic Installation Verification Test EJN Ejection EKG Electrocardiogram (Record) EKG Electrocardiograph (Instrument) EL Elastic Limit EL Electroluminescent EL Elevate EL Elevation Angle EL Equipment List EL MECH Electromechanical ELACS Extended Life Attitude Control System ELB Elbow ELDISC Electrical Disconnect ELDV Electrically Operated Depressurization Valve ELEC Electronic ELEC Electric ELECT Electrical ELECTR Electronics ELEV Elevon ELF Extremely Low Frequency (1 Hz to 3 kHz) ELINT Electromagnetic Intelligence ELMCH Electromechanical ELMS Elements ELMS Elastic Loop Mobility System ELS Earth Landing System (Subsystem) ELS Eastern Launch Site ELS Elevon Load System ELS Emergency Landing Site ELS Energy Loss Spectroscopy ELSC Earth Landing Sequence Controller ELSS Emergency Life Support System ELT Emergency Locator Transmitter ELV Earth Launch Vehicle ELV Electrically Operated Valve ELV Expendable Launch Vehicle ELVIS Expendable Launch Vehicle Integrated Support ELVN Eleven EM Electromagnetic EM Emergency EM Engineering Model EM Exception Monitor EMA Electromagnetic Analysis EMC Electromagnetic Compatibility EMCC Emergency Mission Control Center EMCD Electro-Mechanical Control Diagram EMCI Engineering Model Configuration Inspection EMD Entry Monitor Display EMEC Electromagnetic Effects Capability EMEC Electromagnetic Effects Compatibility EMER Emergency EMES Electriral, Mechanical, and Environmental Systems EMF Electromagnetic Force EMF Electromotive Force EMG Electromyograph(gram) EMG Surface Electromyograms EMI Electromagnetic Interference EMIS Emission EMK Emergency Medical Kit EMK Emergency medical kit EML Electromagnetic Laboratory EMN Engineering Management Network EMON Exception Monitoring EMP Electromagnetic Pulse EMP Equipment Mounting Plate EMPGS Electrical/Mechanical Power Generation Subsystem EMR Engine Mixture Ratio EMRL Equipment Maintenance Requirements List EMS Electromagnetic Susceptibility EMS Engineering Master Schedule EMS Engineering Modeling System EMS Entry Monitor Subsystem EMS Entry Monitoring System EMSF External Maintenance and Servicing Facility EMSS Electromagnetic Servoactuator System EMT Electromechanical Test EMU Engineering Model Unit EMU Extended Memory Unit EMU Extravehicular Mobility Unit EMU-TV Extravehicular Mobility Unit - Television E-MUX Electrical Multiplex ENA Enable ENC Encode ENCD Encode ENCL Enclose END EFF End Effector ENDF Evaluated Neutron Data File ENG Engine, Engineer ENG Electronystagnogram ENGR Engineer ENGRG Engineering ENIAC Electronic Numerical Integrator and Computer ENT Entry ENVIR Environment, Environmental EO Earth Observation EO Earth Orbit EO Engineering Order EO Engine Out EO Equal Opportunity Program Office (KSC Directorate) EOC End of Contract EOC Engine Order Capability EOC Engine-out Capability EOD Entry on Duty EOC EOS Operations Center EOD Environmental Observation Division EOD Estimated on Dock EOD Explosive Ordnance Disposal EODB End of Data Block EOF End of File EOG Electroculogram EOHT External Oxygen and Hydrogen Tanks EOI Earth Orbit Insertion EOL End of Line EOM Earth Observation Mission EOM End of Message EOM End of Mission EOM End of Month EOM Engineering Operations Manual EOM Equations of Motion EOMF End of Minor Frame EOO Equal Opportunity Office EOP Earth and Ocean Physics EOP Emergency Oxygen Pack EOP Experiments of Opportunity EOPAP Earth and Ocean Physics Application Program EOPO Equal Opportunity Program Office EOR Earth Orbit Rendezvous EOS Earth Observation Satellite EOS Earth Observing System EOS Earth Orbit Shuttle EOS Emergency Oxygen Supply EOS Emergency Oxygen System EOS Extended Operating System EOSDIS EOS Data and Information System EOT End of Tape EOT End of Transmission EOW Energy over Weight EP Elbow Pitch EP Electrical Power EP Environmental Protective Plan EP Equivalent Person EPA Environmental Protection Agency EPAR External Tank Project Assessment Review EPC Error Protection Code EPC External Power Contractor EPCDC Electrical Power Conditioning, Distribution, and Control EPD Electrical Power Distribution EPD Emergency Procedures Document EPDB Electrical Power Data Box EPDB Electrical Power Distribution Box EPDB Experiment Power Distribution Box EPDC Electrical Power Distribution and Control EPDCS Electrical Power Distribution and Control System (Subsystem) EPDM Ethylene Propylene Diene Monomer EPDS Electrical Power and Distribution Subsystem EPDS Electrical Power Distribution Subsystem EPDS Electrical Power Distribution System EPDS Experiment Power and Data System EPDU Electrical Power Distribution Unit EPE Energetic Particle Explorer EPG Electrical Power Generator EPL Electrical Power Level EPL Electronic, Electrical, and Electromechanical Parts List EPL Emergency Power Level EPMS Engineering Performance Management System EPO Element Project Office EPOC External Payload Operations Center EPPS Electrical Power/Pyro Sequential System EPR Engine Pressure Ratio EPRN Emergency Program Release Notice EPROM Erasable Programmable Read Only Memory EPS Electrical Power System (Subsystem) EPS Evaluation Planning System EPS Experimental Power Supply EPSP Experiment Power Switching Panel EPT Emergency Procedure Trainer EPT Ethylene Propylene Terpolymer EPTU Events per Time Unit EPWG Environmental Projects Working Group EQ Equivalent EQE Event Queue Element EQL Equal EQUIP Equipment EQUIV Equivalent ER Explanation Report ERA Electrical Replaceable Assembly ERA Exabiology and Radiation Assembly ERAP Earth Resources Aircraft Program ERB Engineering Review Board ERBE Earth Radiation Budget Experiment ERBE-NS ERBE Nonscanner ERBE-S ERBE Scanner ERBS Earth Radiation Budget Satellite ERC Event Recorder ERCA Electrochemically Regenerable CO2 Absorber ERD Experiment Requirements Document EREP Earth Resources Package ERG Ergometer ERIP Experiment Requirement and Implementation Plan ERL Environmental Research Laboratory ERNO 'Entwicklungts Ring Nord' Organization, Space Division of European Consortium, VFW-Fokker-Mannheim, Germany (Spacelab Contractor) ERO Engineering Release Operations EROS Earth Resources Observation System ERP Effected Radiative Power ERP Effective Radiation Power ERP Eye Reference Point ERPM Engineering Requirements and Procedures Manual ERR Error ERR CNTR Error Counter ERRC Expendability/Recoverability/Repair Capability ERS Earth Recovery Subsystem ERS Element Rotation Stand ERS Engineering Release System ERS Entry and Recovery Simulation ERS-1 Earth Remote Sensing Satellite-1 ERSI Elastomeric Reusable Surface Insulation ERSIR Earth Resources Shuttle Imaging Radar ERTS Earth Resources Technology Satellite ERU Earth Rate Unit ERV Expiratory Reserve Volume ES Electrical System ES Equipment Section ES Equipment Shelf ES Escape System ES Experiment Segment ESA Engineering Supply Area ESA Engineering Support Assembly ESA European Space Agency ESA Explosive Safe Area ESB Essential Switching Box ESC Engine Start Command ESC Engineering Support Center ESC Escape ESCA Electron Spectroscopy for Chemical Analysis ESCU Extended Service and Cooling Umbilical ESD Electrostatic Discharge ESD Emergency Shutdown ESD Experiment Systems Division ESDAC European Space Data Center (Darmstadt, Germany) ESDIS Earth Science Data and Information System ESDU Event Storage and Distribution Unit ESE Electrical Support Equipment ESE Electronic Support Equipment ESE EVA Support Equipment ESF Explosive Safe Facility ESI Electrical System Integration ESMC Eastern Space and Missile Center (formerly AFETR), also ETR ESMOS Earth Science Mission Operations and Systems ESO Event Sequence Override ESOC European Space Operations Center ESOW Engineering Statement of Work ESP Electroshock Protection ESP Engine Service Platforms ESP Experiment Sensing Platform ESP External Stowage Platform ESPS Experiment Segment Pallet Simulator ESR Effective Sunrise ESR Engineering Support Request ESRIN European Space Research Institute ESRO European Space Research Organization ESS Effective Sunset ESS Environmental Support System ESS Equipment Support Section ESS Essential ESS Experiment Subsystem Simulator ESSA Environmental Sciences Services Administration EST Eastern Standard Time EST Estimate(d) ESTA Electronic System Test Equipment ESTA Escape System Test Article ESTEC European Space Research and Technology Center ESTEC European Space Technology Center ESTL Electronic Systems Test Laboratory ESV Emergency Shutoff Valve ESVS Escape Suit Ventilation System ESVS Escape System Ventilation System ESW Engine Status Word ET Edge Thickness ET Elapsed Time ET Elevated Temperature ET Event Timer ET External Tank ET-SEP External Tank Separation ETA Environmental Test Article ETA Estimated Time of Arrival ETA Estimated Time to Acquisition ETA Explosive Transfer Assembly ETA External Tank Attachment ETB Equipment Transfer Bag ETC Earth Terrain Camera ETC Estimate to Completion ETC Greenbelt, Maryland (STDN Site) ETCO Equipment Transfer/Change Order ETD Electrical Terminal Distributor ETD Estimated Turnover Date ETD External Tank Door ETE End-to-End ETI Elapsed Time Indicator ETLOW External Tank Lift-Off Weight ETM Elapsed Time Meter ETP Equipment Test Plan ETR Eastern Test Range (ESME preferred) ETROD Eastern Test Range Operations Directive ETS Electrical Test Set ETS Energy Transfer System ETS External Tank System (Subsystem) ETSS External Tank Separation Subsystem ETVA External Tank Vent Arm EU Electronic Unit EU Engineering Units EU Experimental Unit EUROCOMSATE European Consortium Communications Satellite EUV Extreme Ultraviolet EUVE Extreme Ultraviolet Explorer EV Electron Volts EV Expendable Vehicles EV Extravehicular EVA Earned Value Analysis EVA Earned Value Assessment EVA Extravehicular Activity EVAL Earth Viewing Applications Laboratory EVAL Evaluate, Evaluation EVAP Evaporator EVATA Extravehicular Activity Translational Aid EVC Extravehicular Communications EVCON Events Control (Subsystem) EVCS Extravehicular Communications System EVCU Extravehicular Communications Umbilical EVD External Visual Display EVF Equipment Visibility File EVLSS Extravehicular Life Support System EVM Earth Viewing Module EVMS Earned Value Management System EVMU Extra Vehicular Mobility Unit EVO Engineering Verification Order EVS Equipment Visibility System EVS Extravehicular Suit EVSC Extravehicular Suit Communications EVSS Extravehicular Space Suit EVSU Extravehicular Space Unit EVT Engineering Verification Test EVT Extravehicular Transfer EVVA Extravehicular Visor Assembly EWA Estimated Warehouse Arrival EWE Emergency Window Escape EWO Engineering Work Order EWR Engineering Work Request EX Executive Management Office (KSC Directorate) EXC Experiment Computer EXCH Exchange EXEC Execute EXH Exhaust EXO Experiment Operator (in Spacelab) EXP Expand EXP Experiment EXP Exposure EXPEN Expendable EXT Experiment Terminal (Operator Console on Spacelab) EXT Extension EXT External EXTD Extend EXTER External EXTGH Extinguish F F Fahrenheit F Failure F Farad (SI Unit of Capacitance) F Female F Forward F Front F&E Facility and Environment F&S Fire and Smoke Detection F/A Failure Analysis F/A Fuel-Air F/C Fit Check F/C Flight Controller F/C Fuel Cells F/D Fill/Drain F/E Full/Empty F/F Fill/Full, Full/Fill F/O Fuel/Oxidizer Ratio F/R Flared Rudder FA Failure Analysis FA Final Approach FA Final Assembly FA Flight Aft FA Flight Critical Aft FA Fully Automatic FA/COSI Final Assembly and Closeout System Installation FAA False Alarm Avoidance FAA Federal Aviation Administration FAB Fabricate, Fabrication FAC Facility FACI First Article Configuration Inspection FACO Fabrication and Acceptance Checkout FACO Factory Acceptance Checkout FACO Factory Assembly and Checkout FACO Final Assembly Checkout FACS Facilities Control FACS Finance and Control System FACT Flexible Automatic Circuit Tester FAD Final Approach Display FAF First Aerodynamic Flight FAGS Federation for Astronomical and Geophysical Services FAIR Fabrication, Assembly, and Inspection Record FAJ Final Assembly Jig FAL First Approach and Landing (Test) FAM Familiarization FAMOS Flight Acceleration Monitor Only System FAO Flight Activities Officer FAP Final Approach Plane FAR Failure Analysis Report FAR Federal Aviation Regulation FAR Final Acceptance Review FAR Flight Acceptance Review FAR-UV Far Ultraviolet Camera FARC Federal Archives and Records Center FASCOS Flight Acceleration Safety Cutoff System FAT Flight Attitude Table FAUST Far Ultraviolet Space Telescope FAWG Flight Assignment Working Group FAX Facsimile Transmission FB Feedback FB Final Braking FBAS Fixed Base Aft Station FBC Fluidized-Bed Combustion FBCS Fixed Base Crew Station (SMS) FBS File Backup System FBS Firefighters Breathing System FBS Flare Buildup Study FBV Field Base Visit FBV Fuel Bleed Valve FC Fit Check FC Flight Computer FC Flight Control FC Flight Critical FC Fuel Cell FC Furnace Container FCA Fluids Control Assembly FCA Frequency Control Analysis FCA Functional Compatibility Analysis FCA Functional Configuration Audit FCAF Flight Crew Accommodations Facility FCAP Flight Control Applications Program FCC Federal Communications Commission FCC Flat Conductor Cable FCC Flight Control Computer FCC Flight Crew Compartment FCCP Firm Contract Cost Proposal FCD Flight Control Division (JSC) FCDB Flight Control Data Bus FCE Flight Control Equipment FCE Flight Crew Equipment FCEF Flight Crew Equipment Facility FCEI Facility Contractor End Item FCF First Captive Flight FCF Flight Critical Forward FCF Functional Check Flight FCFM Flight Combustion Facility Monitor FCH Flight Controllers Handbook FCHL Flight Control Hydraulics Laboratory FCI Flight Control Indicator FCI Functional Configuration Identification FCIM Flight Control Interface Module FCIP Flight Cargo Implementation Plan FCIT First Computer Interface Tester FCL Freon Coolant Line FCL Freon Coolant Loop FCMU Foot Controlled Maneuvering Unit FCN Function FCO Final Checkout FCO Functional Checkout FCOH Flight Controllers Operational Handbook FCOS Flight Computer Operating System (Orbiter) FCOS Flight Control Operating System FCOS Flight Control Operational Software FCP Failure Correction Panel FCP Firm Cost Proposal FCP Flight Correction Proposal FCP Fuel Cell Power (Plant) FCPS Fuel Cell Power System (Subsystem) FCR Final Configuration Review FCR Flight Configuration Review FCR Flight Control Room FCRA Fecal Collection Receptacle Assembly FCRT Flight Display CRT FCS Fecal Containment System FCS Federal Communications System FCS Financial Control System FCS Flight Control System (Subsystem) FCS Flight Crew System FCSM Flight Combustion Stability Monitor FCSS Fuel Cell Servicing System FCT Flight Control Team FCT Flight Crew Trainer FCT Fuel Cell Test FCTB Flight Crew Training Building FCTF Fuel Cell Test Facility FCTS Flight Crew Trainer Simulator FCU Fluid Checkout Unit FCW Format Control Words FD Fault Detection FD Feed FD Flight Day FD Flight Deck FD Flight Director FD Freeze Dried FD Function Designator FD WMR Food Warmer FDA Fault Detection and Annunciation FDA Flight Deck Assembly (FDF) FDAI Flight Director Attitude Indicator FDB Fahrenheit Dry Bulb FDD Flight Definition Document FDDB Function Designator Data Base FDE Fluid Dynamics Experiment FDF Flight Data File FDF Flight Dynamics Facility FDI Failure Detector Indicator FDI Fault Detection and Identification FDI Fault Detection and Isolation FDIIR Fault Detection, Isolation, Identification, and Recompensation FDIR Fault Detection Identification/Isolation and Recovery/Recognition FDL Flight Director Loop FDLN Feedline FDM Flight Data Manager FDM Frequency Data Multiplexer FDM Frequency Division Multiplexing FDMA Full Diameter Motorized Door Assembly FDO Fee Determination Official FDO Flight Dynamics Officer FDOR Flight Design Operations Review FDR Final Design Review FDR Flight Data Recorder FDR Functional Design Review FDRD Flight Definition and Requirements Document FDRI Flight Director Rate Indicator FDS Fire Detection and Suppression FDS Flight Design and Scheduling FDS Flight Design System FDS Flight Dynamics Simulator FDS Flight Dynamics Software/System FDS Fluid Distribution System FDS Functional Design Specifications FDSC Flight Dynamics Simulation Complex FDSC Flight Dynamics Situation Complex FDU Fluid Distribution Unit FDX Full Duplex FEA Failure Effects Analysis FEA Fluids Experiment Apparatus FEAT Final Engineering Acceptance Test FEB Forward Equipment Bay FEC Field Engineering Change FEC Forward Events Controller FED Flight Events Demonstration FEDP Facility and Equipment Design Plan FEGLI Federal Employees Group Life Insurance FEID Flight Equipment Interface Device FEID Functional Engineering Interface Device FEM Finite Element Method FEMCPL Facilities and Envir. Measurement Comp. Parts List FEP Flight Evaluation Plan FEP Fluoro Ethel Propane FEP Fluorinated Ethylene Propylene FEP Front End Processor FERD Facility and Equipment Requirements Document FERS Federal Employees Retirement System FES Flash Evaporator System FES Flight Element Set FES Fluid Experiment System FES/VCGS Fluid Experiment System/Vapor Crystal Growth System FESL Failure Effects Summary List FET Field Effect Transistor FET Flight Elapsed Time FEU Flight Equivalent Unit FEW Federally Employed Women FEWG Flight Evaluation Working Group FF Flight Forward FF Flip Flop FF Free Flight FFBD Functional Flow Block Diagram FFC Final Flight Certification FFD Fixed Format Display FFD Functional Flow Diagram FFM Free-Flying (Experiment) Module FFP Firmed Fixed Price FFTO Free-Flying Teleoperator FGE Fine Guidance Electronics FGS Fine Guidance Sensors FGS Fine Guidance System FGSE Fine Guidance System Electronics FH Flex Hose FHC Flight Half Coupling FHD Fixed Head Disk FHF First Horizontal Flight FHO Failed Handover FHP Fuel High Pressure FHS Forward Heat Shield FHST Fixed-Head Star Tracker FI Fault Identification FI Flight Instrumentation FI Formal Inspection FIAR Failure Investigation Action Report FID Failure Identification FID Flight Implementation Directive FIDO Flight Dynamics Officer FIE Flight Instrumentation Engineer FIFO First In-First Out (High Speed Data Buffers) FIG Figure FIIG Federal Item Identification Guide FIL Filament FILE Future Identification and Location Experiment FIO Furnished and Installed by Others FIPS Federal Information Processing Standards FIR Fuel Indicating Reading FIRST Far-Infrared Space Telescope FIS Facility Interface Sheets FIT Fault Isolation Test FIT First Computer Interface Tester FITH Fire-in-the-Hole FIV Fuel Isolation Valve FKB Flight Display Keyboard FKF Flight Kits Facility FL Fail FL Feed Lines FL Flowline FL Forward Link FL MECH Fluid Mechanical FLAP Flight Application Software FLC Federal Library Committee FLC Forward Load Control FLCA Forward Load Control Assembly FLD Field FLEX Flexible FLG Flag FLG Flange FLLK Frustum Lifting Lug Kit FLMC Florida Labor Management Conference FLN Fuel Line FLOT Flotation FLP Flap FLPS Flight Load Preparation System FLR Flare FLR Failure FLS Flight Surgeon FLSC Flexible Linear Shaped Charge FLT Flight FLT Floating FLTR Filter FLTSATCOM Fleet Satellite Communications FLUOR Fluorescent FLW Fellows (TACAN Station) FM Failure Mechanics FM Flight Model FM Frequency Modulation (Modulated) FM Furnace Module FM/FM Frequency Modulation/Frequency Multiplexing FM/PM Frequency Modulation/Phase Modulation FMA Failure Mode Analysis FMAHTS Flight Manifest and Hardware Tracking System FMANTS Flight Manifest FMC Food Machinery Corporation FMCF First Manned Captive Flight FMCS Federal Mediation and Conciliation Service FMDM Flex Multiplexer/Demultiplexer FMEA Failure Modes and Effects Analysis FMEC Forward Master Events Controller FMECA Failure Mode, Effects, and Criticality Analysis FML Fault Message Line FML Final Materials List FMO Flight Medical Officer FMOF First Manned Orbital Flight FMOFEV First Manned Orbital Flight with EVA FMOFPL First Manned Orbital Flight with Payload FMR Field Modification Request FMR Function Max Rate FMS Food Management System (Subsystem) FMSP Frequency Modulation Signal Processor FMSP FM signal processor FMT Flight Management Team FMX FM Transmitter FND Facility Need Date FNL Final FNT Failure Notification Telex FO Fail Operational FO Fiber Optics FO Functional Objective FO/FS Fail-Operational/Fail-Safe FOB Flight Operations Building FOB Free on Board FOC Focus FOC Full Operational Capability FOD Flight Operations Directorate (JSC) FOE Flight Operations Engineer FOF First Operational Flight FOF First Orbital Flight FOF Flight Operations Facilities FOIA Freedom of Information Act FOIH Flight Operations Integration Handbook FOMR Flight Operations Management Room FOP Flight Operations Panel FOP Flight Operations Plan FOP Follow on Production FOPG Flight Operations Planning Group FOPP Follow on Parts Production FOPS Flight Operations Planning Schedule FOR Flight Operations Review FOR Force FORTRAN Formula Translation FOS Faint Object Spectrograph (on HST) FOS Flight Operations Support FOSDIC Film Optical Sensing Device for Input to Computers FOSO Flight Operations Scheduling Officer FOSP Flight Operations Support Personnel FOST Flight Operations Support Team FOT Flight Operations Team FOV Field of View (Vision) FOV First Orbital Vehicle FP Fine Pointing FP Fixed Point FP Flight Plan FP Freezing Point FP Fuel Pressure FP Function Path FPB Fuel Preburner FPBOV Fuel Preburner and Oxidizer Valve FPC Fluids Pressure Control FPC Forward Power Controller FPCA Forward Power Control Assembly FPE Functional Program Element FPEG Fast Pulse Electron Gun FPHB Flight Procedures Handbook FPIF Fixed Price Incentive Fee FPL Florida Power & Light Company FPL Full Power Level FPL Full Power Load FPM Folding Platform Mechanism FPM Feet per Minute FPOV Fuel Preburner Oxidizer Valve FPP Freon Pump Package FPPR Fixed Price with Price Revision FPR Flight Performance Reserve FPS Feet Per Second FPS Flight Per Second FPS Floating Point System FPS Focal Plane Structure FPS Forward Power Supply FPS Frames Per Second FPS2 Feet Per Second Squared FPU Floating Point Unit FPV Flow Proportioning Valve FQ Flight Qualification FQI Flight Qualification Instrumentation FQR Flight Qualification Review FQR Flight Qualification Recorder FQT Formal Qualification Test FR Firing Room FR Flight Rule FR Frame FRAGNET Fragmented Network FRAM Flight Release Attach Mechanism FRB Failure Review Board FRC Flight Research Center, California FRCI Fibrous Refractory Composite Insulation FRCS Forward Reaction Control System (Subsystem) FRD Flight Requirements Document FRE Flight Related Element FRE Format Request Element FREQ Frequency FREQ CONV Frequency Converter FREQ DIV Frequency Divider FRF Flight Readiness Firing FRFT Flight Readiness Firing Test FRJD Forward Reaction Jet Driver FRL Fuselage Reference Line FRL Frame Reference Line FRM Fleet Resource Management FRMT Format FRP Fuselage Reference Plane FRR Flight Readiness Review FRRID Flight Readiness Review Item Description FRRID Flight Readiness Review Item Disposition FRSI Felt Reusable Surface Insulation FRSI Flexible reusable surface insulation FRT Frequency ResponseTest FRT Flight Readiness Test FRT Flight Readiness Training FRZR Freezer FS Fail-Safe FS Fail to Sync FS Fault Summary FS Federal Specification FS Fire Suppression FS Flight System FS Freon Servicer FS Full Scale FS Functional Schematic FS Fuselage Station FSAA Flight Simulator for Advanced Aircraft FSC Federal Stock Classification FSCM Federal Supply Code for Manufacturers FSCP Fire Sensor Control Panel FSD Flight Simulation Division (JSC) FSD Full Scale Development FSE Flight Simulation Engineer FSF First Static Firing FSGS Flare/Shallow Glide Slope FSI Final Systems Installation FSIM Functional Simulator FSIWG Flight System Interface Working Group FSK Frequency Shift Keyed (Keying) FSL Flight Simulation Laboratory FSL Flight Systems Laboratory FSLO First Spacelab Payload FSLT First Sea Level Test FSM Fuel Supply Module FSN Federal Stock Number FSO Functional Supplementary Objective FSOH Flight Support Operations Handbook FSOP Florida Safety Operating Plan FSP Fault Summary Page FSR Final System Release FSR Flight Specific Requirements FSRR Flight System Readiness Review FSRR Flight Software Readiness Review FSRS Flight System Recording System FSS Field Spectrometer System FSS Fire Suppression System FSS Fixed Service Structure FSS Flight Support Station (for MMU) FSS Flight Support Structure FSS Flight Support System FSS Flight Systems Simulator FSSR Functional Subsystem Software Requirements FSSR Flight Systems Software Requirements FSTE Factory Special Test Equipment FSU Freon Servicing Unit FSW Flight Software FT Feet FT Flight Team FT Flight Test FT Formal Training FT Functional Test FT/SEC Feet per Second FT&C Formal Training and Certification FTA Fatigue Test Article FTA Fault Tree Analysis FTA Flight Test Article FTC Flight Test Conductor FTC Florida Test Center (MDAC) FTE Factory Test Equipment FTE Flight Test Engineer FTE Forced Test End FTE Full Time Equivalent FTIS Flight Test Instrumentation System FTO Flight Test Objective FTO Functional Test Objective FTOH Flight Team Operations Handbook FTOH Flight Test Operations Handbook FTP Flight Test Procedure FTP Full Throttle Position FTP Function Test Progress FTP Functional Test Program FTR Flight Test Requirement FTR Functional Test Requirement FTRD Flight Test Requirements Document FTRD Functional Test Requirements Document FTS Federal Telecommunications System FTS Flight Test Station FTS Flight Test System FTS Functional Test Specifications FU Flight Unit FU Fuel FUB Forward Utility Bridge FUD First Use Date FUNC Function FUNCT Functional FUO Follow-up Output FUS Fuselage FUS/LF Fuselage, Lower Forward FUS/UF Fuselage, Upper Forward FUSLG Fuselage FV Flight Version FV Front View FVF First Vertical Flight FVMS Fluid Volume Measurement System FVV Facility Verification Vehicle FW Flag Word FW Fuel Wasting FWB Fahrenheit Wet Bulb FWC Filament Wound Case FWD Forward FWD HT SHLD Forward Heat Shield FWG Facility Working Group FWHM Full Width at Half Maximum FWSI Fairchild-Weston Systems, Inc. FWW Food, Water, and Waste FWWM Food, Water, and Waste Management FWWMS Food, Water, and Waste Management System (Subsystem) FXD Fixed FY Fiscal Year G 2GRLV 2nd Generation Return to Launch Vehicle G Giga (Billion) G Gravity G Gravitational Constant G Units of Gravitational Force g gram G&A General and Administrative G&C Guidance and Control G&N Guidance and Navigation G&NS Guidance and Navigation Subsystem G-A Ground-to-Air G-G Ground-to-Ground G-II Gulfstream II (Shuttle Training Aircraft) G-GPRF Gradient General Purpose Rocket Furnace G-MEM General Memory G-MEM GPC-Memory G-V Gravity-Velocity G/A Ground-to-Air G/E Graphite Epoxy G/G Ground-to-Ground G/S Guided steering G/T Antenna Gain-to-Noise Temperature Ratio G/T Gradient-to-Cooling Ratio GA Gage GA General Assembly GA Glide Angle GA Gyro Assembly GA&CS Ground Acquisition and Command Station GAC Ground Attitude Control GAC Grumman Aerospace Corporation GACU Ground Air Conditioning Unit GACU Ground Avionics Cooling Unit GAIN Graphic Aids for Investigating Networks GAM Gamma GAO Government Accountability Office (formerly General Accounting Office until July 2004) GAP GOAL Automatic Procedure GAPL Group Assembly Parts List GAS Get-Away Special GASPI Guidance Attitude Space Position Indicator GATP Ground Acceptance/Article Test Procedure GATT Gate Assisted Turnoff Thyristor GBI Grand Bahama Island GBL Government Bill of Lading GBR Glass Bead Rating GBS Ground Based Software GC Gigacycles (1000 Megacycles) GC Ground Control GC Guidance Control GC Gyrocompassing GCA Ground Controlled Approach GCC Ground Communications Coordinator GCC Ground Control Center GCCC Ground Control Computer Center GCCO Ground Control Checkout GCD Gyro-Compass, Desired Cluster Orientation GCDC Ground Checkout Display and Control GCDCS Ground Checkout Display and Control System GCE Ground Checkout Equipment GCF Ground Communications Facility GCHX Ground Cooling Heat Exchanger GCI Ground Controlled Interception GCIL Ground Command Interface Logic GCIL Ground Control Interface Logic GCILC Ground Command Interface Logic Controller GCILU Ground Control Interface Logic Unit GCL Ground Control Landing GCL Ground Coolant Loop GCN Ground Communications Network (A/G Worldwide Net) GCN Ground Control Network GCO Ground Checkout GCOS General Computer Operational System GCOS Ground Computer Operating System GCR Galactic Cosmic Ray GCR Ground Controlled Radar GCS Ground Communications System GCS Guidance Cutoff Signal GCTS Gas Component Test Stand GCTS Ground Communication(s) Tracking System GCV Gaseous Oxygen Control Valve GCU General Control Unit GCU Generator Control Unit GCU Ground Cooling Unit GCU Gyro Coupling Unit GD Guard GDA Gimbal Drive Actuator/Assembly GDBS Generalized Data Base System GDC General Dynamics Convair GDC Gyro Display Coupler GDP Generalized Documentation Processor GDS GNC Dynamic Simulator GDS Goldstone, California (STDN) GDSD Ground Data Systems Division GDSM Ground Data Systems Manager GDSO Ground Data Systems Officer GDSSR GDSD Staff Support Room GDX Goldstone, CA (STDN Site, 2nd Antenna) GE General Electric GECALL GCOS Program Element Name GEDAC General Electric Detection and Automatic Correction GEN Generate, Generator GENOPAUSE Geodetic Satellite in Polar Geosynchronous Orbit GEOD Geodetic GEOSEPS General Summary Edit Program GEOSEPS Geosynchronous Solar Electric Propulsion Stage GERT Graphical Evaluation and Review Technique GES Goddard Experiment Support System GESYOT GCOS Program Element Name GET Ground Elapsed Time GETI Ground Elapsed Time of Ignition GETIL Ground Elapsed Time of Landing (for TIG of Abort Burn) GETS Ground Equipment Test Sets GF Gage Factor GF&P Gases, Fluids, and Propellants GFAE Government Furnished Aerospace Equipment GFAE Government Furnished Aircraft Equipment GFD Government Furnished Data GFE Government Furnished Equipment GFFC Geophysical Fluid Flow Cell Experiment GFGAS Gradient Furnace for Get Away Special Canister GFM Government Furnished Material GFP Government Furnished Property GFRP Glass Fiber Reinforced Plastics GFRP Graphite Fiber Reinforced Plastics GFS Government Furnished Software GFY Government Fiscal Year GG Gas Generator GG Gravity Gradient GH2 Gaseous Hydrogen GHA Greenwich Hour Angle GHA General Housekeeping Area GHC Ground Half Coupling GHX Ground Heat Exchanger GHe Gaseous Helium GHz Gigahertz GIA GPC Interface Adapter GIDEP Government-Industry Data Exchange Program GIE Ground Instrumentation Equipment GIM Generalized Information Management GIRD Ground Integration Requirements Document GIS Geographic Information System GITG Ground Interface Technical Group GIWG Ground Interface Working Group GLA General Luminary Assembly GLAADS Gun Low Altitude Air Defense System GLAST Gamma-ray Large Area Space Telescope GLC Generator Line Contractor GLD Glide Slope GLL Galileo GLOW Gross Lift-Off Weight GLOW Ground Lift-Off Weight GLP Goal Language Processor GLRSHLD Glare Shield GLS Ground Launch Sequence (Sequencer) GLY Glycol GLY Water-Glycol Mixture GM Gaseous Mixture GM Geometric Mean GMAL General Electric Macro Assembly Language GMBL Gimbal GMCL Ground Measurements Command List GMIL Spaceflight Tracking and Data Network (STDN) GML General Measurement Loop GMML Ground Master Measurements List GMN Gorman (TACAN Station) GMT Greenwich Mean Time GN Gain GN Ground Network GN2 Gaseous Nitrogen GN&C Guidance, Navigation and Control GNC Guidance and Navigation Computer GNCFTS GN&C Flight Test Station GNCIS GN&C Integration Simulator GNCS Guidance and Navigation Control System GNCTS GN&C Test Station GND Ground GND C/O Ground Checkout GNP Gross National Product GO General Order GO2 Gaseous Oxygen GOAL Ground Operations Aerospace Language GOC Ground Operations Coordinator GOCA Ground Operations Control Area GOE Ground Operating Equipment GOES Geostationary Environmental Satellite System GOES Geostationary Operational Environment Satellite GOES Geosynchronous Operational Environmental Satellite GOM KSC Ground Operations Manager at DFRC or WSMR GOMMS Ground Operations and Material Management System GOMS Ground Operations Management System GOP Ground Operations Panel GOPG Ground Operations Planning Group GOR Ground Operations Review GORP Ground Operations Requirements Plan GORP Ground Operations Review Panel GORS Ground Observer RF System GOSS Ground Operations Support System GOWG Ground Operations Working Group GOX Gaseous Oxygen (GO2) GP General Purpose GP General Publication (RSC) GP Group GP-B Gravity Probe B GPA General Purpose Amplifier GPAS General PurPose Airborne Simulator GPBIM General Purpose Buffer Interface Module GPC Gel Permeation Chromatograph GPC General Purpose Computer GPCB GOAL Program Control Block GPD Gimbal Position Display GPES Goal Performance Evaluation System GPH Gallons per Hour GPI Gimbal Position Indicator GPI Ground Position Indicator GPL General Purpose Laboratory GPL Goal Processing Language GPM Gallons per Minute GPME General Purpose Mission Equipment GPRN GOAL Test Procedure Release Notice GPS Gallons per Second GPS General Processing Subsystem GPS Global Positioning Satellite GPS Global Positioning System GPS Ground Power Supply GPS Ground Processing Simulation GPSS General Purpose System Simulator GPTE General Purpose Test Equipment GPU Ground Power Unit GPUR GOAL Test Procedure Update Request GR Ground Rule GRC Glenn Research Center GRE Gamma Ray Explorer GRID Graphic Retrieval and Information Display GRN Green GRO Gamma Ray Observatory GRTLS Glide Return to Launch Site GRTLS Glide Return to Landing Site GS Gas Servicer GS Glide Slope GS Ground Speed GS Ground Station GS Ground System GSA General Services Administration GSAT General Satellite (STS) GSCU Ground Service Cooling Unit GSDL Ground Software Development Laboratory GSE Ground Servicing Equipment GSE Ground Support Equipment GSEL Ground Support Equipment List GSFC Goddard Space Flight Center (Greenbelt, MD) GSI Government Source Inspection GSI Glide Slope Indicator GSIU Ground Standard Interface Unit GSO Ground Support Office GSO Ground Support Operations GSO Ground Systems Operations GSOC Guide Star Occultation Utility GSRP Ground Safety Review Panel GSS Ground Support Software GSS Ground Support System GSSA Ground Support Systems Activation GSSC Ground Support Simulation Computer GSSC Ground Support Systems Contractor GSSI Ground Support System Integration GST Ground System Test GSTAR General Satellite (ELV) GSTDN Ground Spacecraft Tracking and Data Network GSTDN Ground Space Flight Tracking and Data Network GSTF Ground Systems Test Flow GSU Gas Servicer Unit GSVP Ground Support Verification Plan GT Greater Than GT Ground Team GT Ground Test GT Gyro Torque GT&A Ground Test and Acceptance GTA Gas Tungsten Arc GTA Ground Test Access GTA Ground Test Article GTA Ground Torquing Assembly GTC Glycol Trim Console GTC Ground Test Conductor GTCU Ground Thermal Conditioning Unit GTI Grand Turk Island GTI Ground Test Instrumentation GTM Ground Team Manager GTM Ground Test Motor GTS General Test Support GTS GN&C Test Station GTS GNS Test Station GTU Glycol Trim Unit GUCP Ground Umbilical Carrier Plate GUI Graphical User Interface GUID Guidance GUIDO Guidance Officer GUL GSE Utilization List GUSB Guided Unified S-Band GVA GOX Vent Arm GVO Gaviota (TACAN Station) GVT Ground Vibration Test GVTA Ground Vibration Test Article GW Gross Weight GWA General Work Area GWM Guam (STDN) GWT Ground Winds Tower GYM Guaymas, Mexico (Remote Site) GYRO Gyroscope GYROA Gyro A GYROCOMP Gyrocompassing H H Altitude H Hazardous (Task Classification) H Head H Henry (SI Unit) H High H Horizontal H Hot H Momentum h Hours H Altitude Rate (H) Hazardous (Task Classification) H2 Hawaii H2 Hydrogen H2O Water H-CITE Horizontal-Cargo Integration Test Equipment H/E Heat Exchanger H/L Hardline H/O Handover H/S Heat Shield H/S IR Hardware/Software Integration Review H/T Heat Treat H/W Hardware HA Apogee Altitude HA Hazard Analysis HA High Altitude HAA High Altitude Abort HAB Habitation HABT Habitability Technology HAC Heading Alignment Center HAC Heading Alignment Circle HAC Heading Alignment Cone HAC Heading Alignment Cylinder HACBSS Homestead and Community Broadcasting Satellite Service HAD Heat Actuated Device HAFB Holloman Air Force Base HAINS High-Accuracy Inertial Navigation System HAK Horizontal Access Kit HAL High Order Articulated Language HAL High Order Assembly Language HAL High Temperature Acoustic Levitator HAL Houston Aerospace Language HAL/S High Order Assembly Language for Shuttle Flight Computer HAL/S High Order Assembly Language/Shuttle HAL/S High Order Programming Language for Spacelab Usage HALEX Halogen Lamp Experiment HALOE Halogen Occultation Experiment HAM Height Adjustment Maneuver HAO High Altitude Observatory HAP Hardware Allocation Panel HAPI High Altitude Plasma Instrument HARP Hyperbolic Analyzer Retarding Potential HAS Holddown Alignment Support HAS Hydraulic Actuation System HAS Hydrogen Actuation System HAST High Altitude Supersonic Target HAW Hawaii (STDN) HB Handbook HB High Bay HBR High Bit Rate HBT Heflex Bioengineering Test HBW Hot Bridge Wire HC Hand Controller HC Head Count HC Hybrid Computer HCED Hand Controller Engage Driver HCF High Cycle Fatigue HCF HIM Configuration File HCL Horizontal Centerline HCM Hard Copy Module HCMM Heat Capacity Mapping Mission HCR High Cross Range HCSI Hughes Communications Services, Inc. HCSL Hybrid Computation and Simulation Laboratory HCU Hydraulic Charging Unit HCV Hydrogen Check Valve HD Hoiddown HD Horizontal Drain HD Hydrogen Drain HD Highly Desirable HD Heavy Duty HDA Housekeeping Data Acquisition HDC HYbrid Device Controller HDC Hasselblad Data Camera HDDR High-Density Digital Recorder HDG Heading HDP Holddown Post HDQ Headquarters HDR High Data Rate HDRA High Data Rate Assembly HDRM High Data Rate Multiplexer HDRR High Data Rate Recorder HDRR High-data-rate recorder HDRSS High Data Rate Storage System HDS Hardware Description Sheet HDST Headset HDW Hardware HDWE Hardware HE Heat Exchange (Exchanger) HE High Energy Astrophysics He Helium HEAO High Energy Astronomy Observatory HEAP High Energy Aim Point HECV Helium Check Valve HEDS Human Exploration and Development of Space HEG Helium Gage HEGV Helium Gage Valve HEM Hitchhike Experiment Module HEMI Hemispherical (S-Band Antenna) HEMV Helium Manual Valve HEO High Energy Orbit HEPA High Efficiency Particle Accumulator HEPA High Efficiency Particle Air (Filter) HER HIM Equipment Rack HERSCP Hazardous Exposure Reduction and Safety Criteria Plan HESS High Energy Squib Simulator HETM Hybrid Engineering Test Model HEX Heat Exchanger HEX Hexadecimal HEX Hexagon HF Hard Failure HF High Frequency HF Horizontal Flight HF Hot Firing HF Hydrogen Fill HF Hyperfiltration HFA High Frequency Accelerometer HFC Heat Flow and Convection HFC Hydraulic Flight Control HFCT Hydraulic Flight Control Test HFCV Helium Flow Control Valve HFDS Hydrogen Fluid Distribution System HFE High Frequency Executive HFM Hollow Fiber Membrane HFMU High Fidelity Mockup HFO High Frequency oscillator HFS Horizontal Flight Simulator HFT Horizontal Flight Test HFTF Horizontal Flight Test Facility HFTS Horizontal Flight Test Simulator HFX High Frequency Transceiver HG High Gain HG Hitchhiker Goddard Mission Hg Mercury HGA High Gain Antenna HGAS High Gain Antenna System HGDS Hazardous Gas Detection System HGM Hot-Gas Manifold HGR Hangar HGR&SPTFAC Hangar and Support Facility HGS Hydrogen Gas Saver HGV Hydrogen Gas Valve HGVT Horizontal Ground Vibration Test HHC Hammer Head Crane HHMU Hand Held Maneuvering Unit HI High HI Honeywell, Inc. HIC Hickam Air Force Base, Hawaii (Deorb OPT site) HID Hardware Interface Device HID HIM Interface Distributor HIM Hardware Interface Module HIP Hardware Interface Program HIPC High Chamber Pressure HIPO Hierarchical Input/Process Output HIPO Hierarchy Plus Input/Process/Output HISAM Hardware Initiated Standalone Memory HIST History HITS High Rate Multiplexer Input/Output Test System HIU Headset Interface Unit HIV Helium Isolation Valve HK Housekeeping HL Hardline HL Heel Line HL High Level HL Hinge Line HL Hydrogen Line HLAL High Level Assembler Language HLD Hold HLDS Hydrogen Leak Detection System HLMT Helmet HLTL High Level Test Language HM Hinge Mount HMA Hypergot Maintenance Area HMC Hybrid Microcircuit HMC Hypergolic Maintenance and Checkout HMCC Hypergolic Maintenance and Checkout Cell HMCF Hypergolic Maintenance and Checkout Facility HMD Helmet-Mounted Display HMF Horizontal Mating Facility HMF Hypergol Maintenance Facility HMP Hydrozene Monopropeflant (RCS Propellant) HMS History Memory System HMU Hardware Mockup HMV Hydrogen Manual Valve HNDLER Handler HNGR Hangar HO Hydrogen-Oxygen HOL High Order Language HOLC High Order Language Computer HORIZ Horizon, Horizontal HOS High Order Software HOSC Huntsville Operations Support Center HP Handling Procedure HP Hewlett Packard HP High Pressure HP Hydrogen Purge HP Perigee Altitude HPF Horizontal Processing Facility (O&C) HPFD High Pressure Fuel Duct HPFTP High Pressure Fuel Turbopump HPG High Pressure Gas HPGS High Pressure Gas System HPI High Performance Insulation HPOP High Pressure Oxidizer Pump HPOT High Pressure Oxidizer Turbopump HPOTP High Pressure Oxidizer Turbopump HPPF Horizontal Payloads Processing Facility HPR Hydrogen Pressure Regulator HPRV Hydrogen Pressure Relief Valve HPS Hydraulic Power System HPT High Pressure Test HPU Hydraulic Power Unit HPV High Pressure Valve HQ Headquarters HQR Handling Qualities Rating (Cooper-Harper) HR Historical Record HR Hydrogen Relief hr Hour HRAA High Rate Acquisition Assembly HRAP High Resolution Accelerometer Package HRC Hasselblad Reflex Camera HRD Hatch Restraint Device HRD High Rate Dosimeter HRDA High Rate Data Assembly HRDM High Rate Demultiplexer HRDR High Rate Digital Recorder HRDS High Rate Data Station HRFM High Rate Frame Multiplexer HRIR High Resolution Infrared Radiometer HRL Horizontal Reference Line HRM High Rate Multiplexer HRM High Ratio Multiplier HRPS Hazard Reduction Precedence Sequence HRS Hours HRSI High Temperature Reusable Surface Insulation HROS High Resolution Objective Spectrometer HRT High Resolution Tracker HS Heat Shield HS High Speed HS Horizon Sensor HS-C Hamilton Standard CO2 Absorbent Material HSC Hardware/Software Coordination HSCU Hydraulic Supply and Checkout Unit HSD Horizontal Situation Display HSD High Speed Data HSD Hamilton Standard Division HSDL High Speed Data Line HSF Hypergot Servicing Facility HSG High Sustained Gs Acceleration HSI Horizontal Situation Indicator HSK Horizontal Sling Kit HSL Hardware Simulation Laboratory HSNG Housing HSP Health Stabilization Program HSP High Speed Printer HSR Hardware Status Register HSS High Speed Reader HSS High Stress Strain HSS Hydraulic Subsystem Simulator HST Hubble Space Telescope HSTP Hard Stop HSU Helium Service Unit HT Heat Transfer HT Height HT High Technology HTC Hybrid Technology Computer HTEXCH Heat Exchanger HTG Heating HTLL High Test Level Language HTM High Temperature HTPB Hydroxyl Terminated Polybutadiene (Propellant) HTR Heater HTR Hydroxyl Terminated Polybutyiene HTS Heat Transfer System HTS Heat Transport Section HUD Head Up Display HUDE Head Up Display Electronics HUL Hardware Utilization List HUM Humidity HUT Hard Upper Torso HV High Velocity HV High Voltage HV Hydrogen Vent HVAC Heating, Ventilating, and Air Conditioning HVDS Hypergolic Vapor Detection System HVPS High Voltage Power Supply HVR Hover HVSF Honeywell Verification Simulation Facility HVSL Holidays, Vacation, and Sick Leave HW Hardware HW Headwind HW Hotwire HW/SW Hardware/Software HWWS Hyperfiltration Wash Water Recovery System HX Heat Exchanger HXIS Hard X-ray Imaging Spectrometer HYD Hydraulic Subsystem HYD Hydraulics HYGL Hypergolic HYPACE Hybrid Programmable Attitude Control Electronics Hz Hertz (Cycles Per Second) HZE Highly Charged and Energetic Particles I I Inertias I Inner I Iodine I Irradiated I LOAD Initialization Load I&C Installation and Checkout I&C/O Installation and Checkout I&PS Institutional and Program Support I&O Inlet and Outlet I&R Interchangeability and Replaceability I&R Interchangeability and Replacement I&RS Instrument and Range Safety I&S Interchangeability and Substitutability I&T Integration and Test I-GPRF Isothermal General Purpose Rocket Furnace I-LOS Initial Data Load I/A Interface Adapter I/C Intercom I/E Input Electronics I/F Interface I/FU Interface Unit I/O Input/Output I/OB Input/Output Bus I/OC Input/Output Controller I/OMI Integration/Operations and Maintenance Instruction I/OP Input/Outboard Profile I/OT Input/Output Test I/OU Input/Output Unit I/P In Progress I/T Intertank I/V Inlet Valve IA Implementation Agency IA Input Axis IA Inverter Assembly IA Issuing Agency IA/V Internal Audio and Video IAA International Aerospace Abstracts IAB IUS Assembly Building IAC Integrated Analysis Capability IAC Interface Adapter Unit IACS Inertial Attitude Control System IAD Interface Agreement Document IAD Interface Analysis Document IAL Immediate Action Letter IAL International Algebraic Language IandC Instrument and Communication IandC Instrumentation and Communication IAM International Association of Machinists IARS Independent Air Revitalization System IAS Impact Assessment Sheet IAS Indicated Airspeed IAS Integrated Avionics System IASS Inverter/ATCS Support Structure IAT Integrated Avionics Test IAU International Astronomical Union IAV Inventory Adjustment Voucher IB Inboard IB Inert Building IB Instruction Book IBF Internally Blown Flap IBM International Business Machines IBSE Initial Blood Storage Experiment IBSS Infrared Background Signature Survey IC Incremental Cost IC Information Center IC Initial Condition IC Integrated Circuit IC Intercom (Orbiter to Ground via Hardline) IC Intercommunications IC Intercomputer IC Intercomputer Communication IC Interim Change IC Internal Combustion IC Ion Chamber IC/ES Intercommunication/Emergency Station ICA Item Change Analysis ICAO International Civil Aviation Organization ICAR Investigation and Corrective Action Report ICAT Integrated Change Assessment Team ICB Interim Change Bulletin ICB Interrupt Control Block ICBC IMAX Cargo Bay Camera ICC Intercomputer Channel ICC Intercomputer Communication ICC Interface Control Chart ICC Interstate Commerce Commission ICCB Integrated Change Control Board ICCP Interface Coordination and Control Procedure ICD Interface Control Document ICD Interface Control Drawing ICDR Incremental Critical Design Review ICDU Inertial Coupling Data Unit ICE Input Control Element ICE Instrument Checkout Equipment ICE Instrument/Communication Equipment ICF Interface Control Function ICG In-Flight Coverall Garment ICH Interchanger ICIO Interim Cargo Integration Operations ICMO Integrated Configuration Management Office ICMS Indirect Cost Management System ICMS Integrated Configuration Management System ICMS Intercom Master Station ICMT Intercontract Material Transfer ICO Integrated Checkout ICOM Intercommunications ICOS Improved Crew Optical Sight ICOU Inertial Coupling Data Unit ICP ICS Control Program ICP Inventory Control Point ICR Instruction Change Request ICR Interface Compatibility Record ICS Instrumentation Control System ICS Integrated Checkout Station ICS Intercommunication System ICS Interface Control Specification ICS Interpretive Computer Simulator ICT Influence Coefficient Tests ICT Interface Control Tooling ICTC Inertial Components Temperature Controller ICU Interface Control Unit ICW Interrupted Continuous Wave ICWG Interface Control Working Group ID Identification ID Identification Data ID Inside Diameter (id preferred) ID Interface Document ID&CA Inverter Distribution and Control Assembly IDA Interface Display Assembly IDAC Integrated Digital-Analog Converter IDAS Integrated Data Acquisition System IDB lnsuit Drink Bag IDC IMBLMS Digital Computer IDC Integrated Displays and Controls IDC Interface Document Control IDCA Inverter Distribution and Control Assembly IDD Interface Definition Document(s) IDE Initial Design Evaluation IDG Integrated Drive Generator IDI InDyne, Inc. IDI Instrumentation Data Items IDLH Immediately Dangerous to Life and Health IDMM Intermediate and Depot Maintenance Manual IDO Interdivisional Operations IDP Integrated Data Processor IDPS Interface Digital Processor IDR Intermediate Design Review IDR Interim Discrepancy Report IDR Initial Design Review IDRD Internal Data Requirement Description IDRD Information Definition Requirements Document IDS Interface Data Sheet IDS Item Description Sheet IDSD Institutional Data System Division (JSC) IDSO Interdivisional Sales Order IDT I-Load Data Tape IDTA Interdivisional Technical Agreement IDU Interface Demonstration Unit IDWA Interdivisional Work Authorization IE Industrial Engineering IEA Integrated Electronic Assembly IECM Induced Environment Contamination Monitor IECO Inboard Engine Cutoff IECS Igloo Environment Control Subsystem IED Interacting Equipment Documents IEEE Institute of Electrical and Electronics Engineers IEF Isoelectric Focusing IEP Instantaneous Effective Photo Cathodes IF Inertial Fusion IF Integration Facility IF Intermediate Frequency IFA In-Flight Analyses IFA Interface Functional Analysis IFASC Integrated Functions Assessment Steering Committ IFB Invitation for Bid IFM In-Flight Maintenance IFO Information Systems Office IFOT In-Flight Operations and Training IFR Instrument Flight Rules IFRU In-Flight Replacement Unit IFT In-Flight Test IFTM In-Flight Test Maintenance IFTS In-Flight Test System IFU Interface Unit IG Igloo IGA Inner Gimbal Angle IGAX Inner Gimbal Axis IGDS Iodine Generating and Dispensing System IGM Interactive Guidance Mode IGN Ignition, Ignite IGOR Intercept Ground Optical Recorder IGS Inertial Guidance System IGSE In-Space Ground Support Equipment IGV Inlet Guide Valve/Vanes IH/SR Integration Hardware and software Review IHP Indicated Horsepower IHTV Interim Hypersonics Test Vehicle IHX Interloop Heat Exchanger IIG Interrange Instrumentation Group IIS Inspection Item Sheet IITCS Igloo Internal Thermal Control Section ILA Instrument Landing Approach ILAS Instrument Landing Approach System ILC Initial Launch Capability ILC Intermediate Loads Cycle ILC International Latex Corporation ILCCS Integrated Launch Control and Checkout System ILLUM Illuminate ILS Instrument Landing System ILP Integrated Logistics Panel ILS Integrated Logistics Support ILS Integrated Logistics System ILS/LAR Integrated Logistics System and Logistics Assess Review ILSP Integrated Logistics Support Plan ILSSE Integrated Life Science Shuttle Experiments IM Information Memory IM Inner Maker IM Instrument Module IM Interface Module IM Interim Mission IM Intermediate Moisture IMAP Intergrated Mission Analysis Planning IMAX Shuttle Cabin Camera (Manufactured by IMAX, Inc.) IMBLMS Integrated Medical Behavioral Laboratory Measurement System IMC Image Motion Compensation IMCC Integrated Mission Control Center IMCP Integrated Monitor and Control Panel IMD Intermediate IMDB Integrated Maintenance Data Base IME International Magnetospheric Explorer IMF Inventory Master File IMIC Integrated Management Information Computer IML Inside Mold Line IML International Microgravity Laboratory IMP Initial Memory Protection IMP Interplanetary Monitoring Platform IMPD Impedance IMPL Implement IMPLS Impulse IMS Information Management System IMS Institutional Management Support IMS Inventory Management System IMSL Intermediate Seal IMU Inertial Measurement Unit IMU Internal Measurement Unit IN Information Systems Directorate (KSC) IN Inlet in Inch INBD Inboard INBIT Input Bit INC Incomplete INC Increase INC Installation Notice Card INC Installation Notice Certificate INCL Inclination INCL Include INCLN Incline INCO Inconel (nickel, chromium, and iron) INCO Instrumentation and Communication Officer INCR Increase INCR Increment INCS Integrated Network Control System IND Indicate, Indicator IND Industrial INDAT Incoming Data INF Infinite INFT Informal Training INH Inhibit INIT Initial INIT Initiate INJ Inject INL Inlet INMARSAT International Maritime Satellite INOP Inoperative INP Input INR Inertial Reference INRTL Inertial INRTL VEL Inertial Velocity INS Inertial Navigation System INS Insertion Burn, OMS1 INSAT Indian National Satellite INSL Insulate INSP Inspect, Inspection INSPEX Indonesia Space Experiment INSRP Interagency Network Safety Review Panel INST Instrument INST SYS Instrumentation System INST/COMM Instrumentation and Communication INSTL Install, Installation INSTL&C/O Installation and Checkout INSTR Instruct INSTR Instrument, Instrumentation INSTRUM Instrumentation Subsystem INT Integrated Test INT Intensity INT Internal INTASAT Instituto Nacional De Technica Aeroespacial Satellite INTC/O Integrated Checkout INTCHG Interchange INTCHGR Interchanger INTCP Intercept INTEGR Integrate, Integration INTELSAT International Telecommunications Satellite Organization INTEROG Interrogate INTF Interface INTG Integration INTLK Interlock INTR Interior INTRG Interrogate INTRLVR Interleaver INTRPT Interrupt INTV Interim Hypersonics Test Article INTVL Interval INTVLM Intervalometer INV Inverter INV MGT Inventory Management IOA Input/Output Adapter IOA Input/Output or Assembly IOB Input/Output Box IOB Input/Output Buffer IOBPS Input/Output Box and Peripheral Simulator IOC Indirect Operating Costs IOC Initial Operating Capability IOC Initial Operational Capability IOC Input/Output Controller IOCM Interim Operational Contamination Monitor IOCU Input/Output Control Unit IOE Input/Output Error Log Table IOF Initial Operational Flight IOM Input/Output Module IONS Studies of the Ionization States of Solar and Galactic Cosmic Ray IONS Heavy Nucleii IOP In-Orbit Plane IOP Input/Output Port IOP Input/Output Processor IOP Integrated Operation Plan IOP Internal Operating Plan IOPL Integrated Open Problem List IOQE Input/Output Queue Element IOS Indian Ocean Ship (STDN) IOS Indian Ocean STDN Site IOS Input/Output Supervision IOS Instructor Operator Station IOSC Integrated Operations Support Center IOSS Integrated Orbital Service System IOU Input/Output Unit IP Identification of Position IP Igloo Pallet IP Impact Point IP Inertial Processing IP Instructor Pilot IP Instrumentation Payload IP Instrumentation PCM Data Bus IP Intermediate Pallet IP Intermediate Pressure IP International Partner IPA Intergovernmental Personnel Action IPA Isopropyl Alcohol IPACS Integrated Power and Attitude Control System IPAD Integrated Program for Aerospace Vehicle Design IPB Illuminated Push Button IPB Illustrated Parts Breakdown IPC Intermittent Positive Control IPCL Instrumentation Program and Component List IPD Information Processing Division IPDR Incremental Preliminary Design Review IPE Industrial Plant Equipment IPF IUS Processing Facility IPL Indentured Parts List IPL Initial Program Load IPR Interim Problem Report IPS Inches per Second IPS Instrument Pointing System (Subsystem) IPS Instrumentation Power Subsystem IPS Interface Problem Sheets IPS International Pipe Standard IPS Inverter Power Supply IPSL Interface Problem Status Log IPT In-Plant Transporter IPT Integrated Product Team IPT International Pipe Thread IPTCS Igloo Passive Thermal Control Section IR Inclination of the Ascending Return IR Infrared IR Inside Radius IR International Rendezvous IR SPECT Infrared Spectrometer IRAD Internal/Independent Research and Development IRAN Inspection and Repairs as Necessary IRANSAT Iranian Government Communications Satellite (replaces IRAN) IRAR Internal Variable IRD Information Requirements Document IRD Initiating Reference Document IRG Inertial Rate Gyro IRG Inner Roll Gimbal IRIG Inertial Rate Integrating Gyro IRIG-B Interrange Instrumentation Group B IRIS Italian Research Interim Stage IRL Initiating Reference Letter IRL Interface Requirement List IRME Initiator Resistance Measuring Equipment IRN Interface Revision Notice IRR Inspection Rejection Report IRR Integral Rocket Ramjet IRTCM Integrated Real-Time Contamination Monitor IRU Inertial Reference Unit IRV Isotope Reentry Vehicle IS Installation Support IS Interconnecting Station ISA Interim Stowage Assembly ISC Initial Software Configuration Map ISD Instructional Systems Development (USAF) ISE Integrated Synthesis Environment ISEE International Sun-Earth Explorer ISF Industrial Space Facility ISI Initial Systems Installation ISI Instrumentation Support Instruction ISIL Interim Support Items List ISIS International Satellite for Ionospheric Studies ISL Inertial Systems Laboratory ISL/LAR Integrated Logistics System and Logistics Assessment Review ISLM Integration Shop/Lab Manager ISN Inter-Set Network ISO Imaging Spectrometric Observatory ISO Information Systems Office ISO International Organization for Standardization (not an acronym, a short form of the name chosen by the organization) ISOC Institutional Safety Office Contact ISOL Isolate, Isolation ISP Initial Specific Impulse ISP Instrumentation Support Plan ISP Integrated Support Plan ISPG Institutional Support Planning Group ISPM International Solar Polar Mission ISPR International Standard Payload Rack ISR Initial System Release ISS Inertial Subsystem ISS Inhibit/Override Summary Snapshot Display ISS Installation Support Services ISS Instruction Summary Sheet ISS Integrated Support Stand ISS Integrated System Schematic ISS International Space Station ISS IRIS Spinning Stage ISSL Initial Spares Support List ISTA Intertank Structural Test Assembly ISTB Integrated Subsystem Test Bed ISTF Integrated System Test Flow ISU Instrument Switching Unit ISU International Systems of Units IT Identification Transponder IT Installation Test ITA Integrated Test Area ITA Integrated Test Article ITA International Television Academy ITAP Integrated Technical Assessment Panel ITC Igloo Thermal Control ITCB International Training Control Board ITCS Internal Thermal Control System ITE Instrumentation Test Equipment ITE Integration Test Equipment ITE Intersite Transportation Equipment ITI Inspection and Test Instruction ITL Integrate, Transfer, and Launch ITMG Integrated Thermal/Micrometeoroid Garment ITO Integration and Test Order ITRDS Integrated Test Requirements Documents ITS Instrumentation Telemetry Station ITS Interim Teleprinter System IU Instrument Unit IU Interface Unit IUA Inertial Unit Assembly IUA Interface Unit Adapter IUCS Instrumentation Unit Update Command System IUCS Instrumentation Update Command System IUE Interface Unit Error Count Table IUE International Ultravioet Explorer IUS Inertial Upper Stage (was Interim Upper Stage) IUS Interim/Intermediate Upper Stage IUS Interim Use Sheet IUS Interior Upper Stage IV Initial Velocity IV Integrated Vehicle IV Interface Volume IV Intravehicular IVA Intravehicular Activity IVAK Igloo Vertical Access Kit IVAR Internal Variable IVBC Integrated Vehicle Baseline Configuration IVC Intervehicular Communications IVE Interface Verification Equipment IVHM Integrated Vehicle Health Monitoring IVL lntervatometer IVSI Instantaneous Vertical Speed Indicator IVT Interface Verification Test IVT Intervehicular Transfer IVTE Integration and Verification Test Environment IWBS Indirect Work Breakdown Structure IWG Interface Working Group IWG Investigator Working Group J J Joule (SI Unit) J-BOSC Joint Base Operations and Support Contract J/M Jettison Motor JACEE Japanese-American Cooperative Emulsion Experiment JACD Joint Architectural Control Document JAD Joint Assembly Demonstration JAEIC Joint Atomic Energy Intelligence Committee JAN Joint Army-Navy JANNAF Joint Army, Navy, NASA, and Air Force JAS Journal of Aerospace Science JAS Journal of Atmospheric Science JB Junction Box JBOSC Joint Base Operations and Support Contract JCL Job Control Language JCP Joint Power Conditions JCT Junction JEA Joint Endeavor Agreement JED Julian Ephemeris Data JELM Japanese Experiment Logistics Module JEM Japanese Element Module JEM Japanese Experiment Module JES Joint Environment Simulator JETS Joint Electronics Type (Designation) System JETT Jettison JGR Journal of Geophysical Research JIR Job Improvement Request JIS Joint Integrated Simulation JO Job Order JOC Joint Operations Center JOD Joint Occupancy Data JOD Joint Occupancy Date JOFOC Justification for Other Than Full and Open Competition JOIP Joint Operations Interface Procedure JOP Joint Operating Procedure JOP Jupiter Orbiter Probe-Galileo JOR Job Order Request JOV Joint Venture JOVIAL Joules Own Version International Algebraic Language JP Jet Propellant JP Jet Propulsion JPC Joint Power Condition JPDRD Joint Program Definition and Requirements Document JPIC Joint Program Integration Committee JPL Jet Propulsion Laboratory JPOC JSC Payload Operations Center JPP Joint Program Plan JRB Joint Review Board JSA Job Safety Analysis JSC Lyndon B. Johnson Space Center (formerly MSC) JSCM JSC Manual JSL Jet Select Logic JSLWG Joint Spacelab Working Group JST Joint Systems Test JTA Job Task Analysis JTG Joint Training Group JU Joint Use JULIE Joint Utilization of Laser Integrated Experiments JURG Joint Users Requirements Group K K Kelvin K Kilocycle K One Thousand k Kilo (1,000) K&H Memory Time Value K-APM KSC Automated Payloads Plan/Requirement K-APN KSC Automated Payloads Notice K-APPS KSC Automated Payloads Project Specification K-BAND 10,900 to 36,000 MCS K-CITEM KSC CITE Plan/Requirement K-DODM KSC DOD Plan/Requirement K-DPM KSC DOD Payloads Plan/Requirement K-DPN KSC DOD Payloads Notice K-DPPS KSC DOD Payloads Project Specification K-IUSM KSC IUS Plan/Requirement K-IUSN KSC IUS Notice K-IUSPS KSC IUS Project Specification K-MMSEM KSC MMSE Plan/Requirement K-MMSEN KSC MMSE Notice K-MMSEPS KSC MMSE Project Specification K-SLM KSC Spacelab Plan/Requirement K-SLN KSC Spacelab Notice K-SLPS KSC Spacelab Project Specification K-SM KSC Shuttle Management Document K-SPN KSC Shuttle Project Notice K-SPS KSC Shuttle Project Specification K-SSS KSC Shuttle Project Station Set Specification K-STSM KSC STS Plan/Requirement K-STSN KSC STS Notice K-STSPS KSC STS Project Specification K/S Kick Stage KAD Kadena AB, Ryuku Islands (Deorb OPT Site) KAPL KSC Approved Parts List KATE Knowledge-Based Automatic Test Equipment (KSC's) KATS Kennedy Avionics Test Set KAU Kilo Accounting Unit KB Keyboard KB Kilobit KBAC Kennedy Booster Assemblv Contractor KBIM Keyboard Interface Module KBPS Kilobits Per Second KBU Keyboard Unit kc Kilocycle kcal Kilocalorie KCAS Knots Calibrated Airspeed KCCS Kennedy Complex Control System KCRT Keyboard Cathode Ray Tube KCS Keyboard Configuration Studies KDMS Kennedy Data Management System(s) KDN Kinetically Designed Nozzle KDP Kennedy Documented Process KDT Keyboard and Display Test KDU Keyboard and Display Unit KEAS Knots Equivalent Airspeed kg Kilogram kgal/min Kilogallons Per Minute KHB KSC Handbook kHz Kilohertz KIAS Knots Indicated Airspeed KICS Kennedy Integrated Communications Services KIMS Kennedy Inventory Management System KIP Keyboard Input Processor KIS Kitting Instruction Sheet KITE Kinetic Isolation Tether Experiment klb Kilopound km Kilometer KLMRC Kennedy Labor Management Relations Council KMI KSC Management Instruction KMR Kwajalein Missile Range KMS K-Words X Millions of Seconds KN Kitting Notice KN KSC Notice KNO Kano, Nigeria (Remote Site) KNPR Kennedy NASA Procedural Requirements KOI KSC Operation Instruction KOM KSC Organizational Manual KOPS Thousand of Operations per Second KPD KSC Program Directive KPPMC Kennedy Program Project Management Council KPPS Kilopulses per Second KPRD KSC Program Requirements Document KPS Kilometers Per Second KSA Ku-Band Single Access KSC John F. Kennedy Space Center KSC Kennedy Space Center KSCAP Kennedy Space Center Area Permit KSDN Kennedy Switched Data Network KSSS KSC Station Set Specification KT Kit KT Knots KU Keyboard Unit KUSP Ku-Band Signal Processor KUSP Ku-Band Single Processor kV Kilovolt kVA Kilovoltampere kW Kilowatt kWh Kilowatt Hours KYBD Keyboard L L Launch L Launch or Landing Time L Left L Length L Level L Low L Lumen L&C Laboratory and Checkout L&D Landing and Deceleration L&L Launch and Landing L&S Logistics and Support L&T Laboratory and Test L-BAND S-Band 390 to 1550 MHz L-L Line-to-Line L-P Low Pressure L/D Length-to-Diameter L/D Lift-to-Drag (Ratio) L/H Local Horizontal L/O Lift-off L/S Load System L/S Landing Site L/T Load Test LO2 Liquid Oxygen LA Launch Area LA Lanthanum LA Launch Abort LA Launch Azimuth LA Lightning Arrester LA Launch Aft LA Low Attitude LAAD Los Angeles Aircraft Division (Rockwell) LACB Landing Aids Control Building (SLF at KSC) LACIE Large Area Crop Inventory Experiment LACIP Large Area Crop Inventory Program LAGEOS Laser Geodynamic Satellite LAGS Launch Abort Guide Simulation LAIR Liquid Air LAIU Launch Abort Interface Unit LAN Local Area Network LAP Language Assistance Plan LAPS Logistics Analysis and Provisioning System LAPS Left Aft Propulsion System (Subsystem) LAR Logistics Assessment Review LaRC Langley Research Center (Hampton, VA) LARS Laminar Angular Rate Sensor LARSSYAA Laboratory for Application of Remote Sensing System for Aircraft Analysis LASCOT Large Screen Color Television System LASV Low Altitude Supersonic Vehicle LAT Lateral LAT Latch LAT Large Angle Torque LAT Lot Acceptance Test LAT Latitude LATS LDEF Assembly and Transportation System LB Lower Brace LB Low Bay LB Load Bank LB Launch Bus LB Launch Boost lb Pound LBDT Low Bay Dolly Tug LBK Left Bank LBL Left Buttock Line LBM Load Buffer Memory LBNPD Lower Body Negative Pressure Device LBR Low Bit Rate LC Launch Complex LC Launch Countdown LC Launch Critical LC Left Center LCA Launch Control Amplifier LCA Load Controller (Control) Assembly LCB Least Common Bit LCC Launch Commit Criteria LCC Launch Control Center (KSC) LCC Life Cycle Cost LCCD Launch Commit Criteria Document LCD Launch Countdown LCF Low Cycle Fatigue LCG Liquid Cooled Garment LCH Latch LCH Launch LCHTF Low Cycle High Temperature Fatigue LCL Local LCM Least Common Multiple LCMS Low Cost Modular Spacecraft LCO MMC Uniform Central Number LCOM Logic Control Output Module LCR Low Cross Range LCS Laser Communications Subsystem (System) LCS Launch Control System LCS List of Command Signals LCT Launch Countdown LCU Line Coupling Unit LCVG Liquid Cooling and Ventilation Garment LCUG Liquid Cooling Under Garment LD Lateral Direction LD Launch Director LD Loading Dock LDB Launch Data Bus LDB Logistics Data Bank LDEC Lunar Docking Events Controller LDEF Long Duration Exposure Facility LDG Landing LDIU Launch Data Interface Unit LDMK Landmark LDR Large Deployable Reflector LDR Low Data Rate LDS Landing/Deceleration Subsystem LDS Landing, Deservicing, and Safing LDS Laser Docking Sensor LDS Loads LDT Linear Displacement Transducer LE Leading Edge LE Launch Escape LEA Logistics Engineering Analysis (Analyses) LEB Lower Equipment Bay LEC Lockheed Electronics Company LED Light Emitting Diode LEH Launch/Entry Helmet LEM Laboratory Environment Model LEM Launch Escape Monitor LEO Low Earth Orbit LER Long Eye Relief (Optics) LeRC Lewis Research Center (Cleveland, OH) LES Launch Entry Suit LES Launch Equipment Shop LES Launch Escape Subsystem LESS Leading Edge Structure Subsystem LESS Leading Edge Subsystem LETF Launch Equipment Exposure Facility LETF Launch Equipment Test Facility (KSC) LF Launch Facility LF Launch Forward LF Left Forward LF Load Factor LF Low Frequency LFAF Low Frequency Accelerometer Flutter LFAM Low Frequency Accelerometer Modes LFAP Low Frequency Accelerometer Pogo LFC Large Format Camera LFO Low Frequency Oscillator LFOP Landing and Ferry Operations Panel LFRR Low Frequency Radio Range LG Landing Gear LG Length LGA Low Gain Antenna LGIU Laser Gyro Interface Unit LH Left Hand LH2 Liquid Hydrogen LHA Local Hour Angle LHC Left Hand Circular LHCP Left Hand Circular Polarization LHCP Left Hand Circularly Polarized LHe Liquid Helium LHP Left Hand Panel LHS Left Hand Side Li Lithium LIB Left Inboard LIC Load Interface Circuit LID Leadless inverted Device LID Logistics Identification Document LIDAR Laser-Radar LIE Left Inboard Elevon LIM Limit LIMRC LRU Identification and Maintenance Requirements Catal LIMS Logistics Inventory Management System LIN Linear LIN Liquid Nitrogen LINJET Liquid Injection Electric Thruster LINS Laser Inertial Navigation System LiOH Lithium Hydroxide LIQ Liquid LIS Logistics Information System LK Leak LK Lock LL Launch and Landing LL Launch Left LL Lever Lock LL Long Lead LL Long Line LL Low Level LL Lower Left LL Lower Limit LLCF Launch and Landing Computational Facilities LLI Limited Life Item LLIL Long Leadtime Items List LLOS Landmark Line-of-Sight LLP Launch and Landing Project LLPO Launch and Landing Project Office LLS Launch and Landing Site LLT Long Leadtime LM Left Mid LM Long Module LMC Lightweight MPESS Carrier LME Launch Monitor Equipment LMF Lower Mid-Fuselage LMG Left Main Gear LMK Landmark LMP List of Measurement Points LMS Load Measurement System LMS Logistics Master Schedules LMSC Lockheed Missiles and Space Corporation LN Line LN2 Liquid Nitrogen LNCH Launch LNDG Landing LNG Liquefied Natural Gas LO Launch Operations LO Local Oscillator LO Lock-On LO2 Liquid Oxygen LOA Landing Operations Area LOA Launch Operations Area LOACS Launch Operations Access Control System LOAP List of Applicable Publications LOB Left Outboard LOB Line of Balance LOC Localizer LOC Location LOC Launch Operations Complex LOCC Launch Operations Control Center LOE Left Outboard Elevon LOE Level of Effort LOE Line of Effort LOFAR Low Frequency Acquisition and Ranging LOFO Low Frequency Oscillation LOGO Limit of Government Obligation LOI Lunar Orbit Insertion LOL Limit of Liability LOLI Limited Operational-Life Items LON Launch On Need LON Longitude LON LPS Operations Network LONG Longitude LOR Lunar Orbit Rendezvous LORA Level of Repair Analysis LORAN Long Range Navigation LOS Lift-Off Simulator LOS Line of Sight LOS Loss of Signal LOS Loss of Sync LOT Lift-Off Time LOTO Lockout/Tagout LOV Limit of Visibility LOV Loss of Visibility LOWG Landing Operations Working Group LOX Liquid Oxygen (LO2 LP Launch Pad LP Liquid Propellant LP Low Pressure LPD Landing Point Designator LPD Launch Procedure Document LPD Low Profile Dolly LPDM List of Physical Dimensions LPF Low Pass Filter LPFT LOPW Pressure Fuel Turboprop LPFTP Low Pressure Fuel Turbopump LPG Last Page Generator (Distribution List Used in All OMTs) LPG Liquid Propellant Gun LPLWS Launch Pad Lightning Warning System LPM Lines per Minute LPOP Low Pressure Oxidizer Turbopump LPOT Low-Pressure Oxidizer Turbopump LPOTP Low Pressure Oxidizer Turbopump LPOX Low Pressure Oxygen LPR Line Printer LPS Launch Processing (Processor) System LPS Liters Per Second LPS/CDS LPS/Central Data Subsystem LPTTL Low Power Transistor-Transistor Logic LPW Lumens per Watt LR Landing Radar LR Launch Right LR Left Rudder LR Lower Right LR/LD Line Receiver/Line Driver LRECL Logical Records of Fixed Length LRF Liquid Rocket Fuel LRO Large Radio Observatory LRR Launch Readiness Review LRSI Low Temperature Reusable Surface Insulation LRU Line Replaceable Unit LRV Long Range Video LRV Launch Readiness Verification LS Limit Switch LS Launch Sequence LS Landing Side LS Left Side LS Life Science LS/ST Light Shield/Star Tracker LSA Launch Services Agreement LSA Logistics Support Analysis LSAH Launch Site Accommodations Handbook LSAP Launch Sequence Applications Program LSAR Logistics Support Analysis Record LSB Lower Side Band LSB Least Significant Bit LSC Linear Shaped Charge LSCA Logistics Support Cost Analysis LSD Low Speed Data LSD Landing Ship Dock LSE Launch Support Equipment LSE Life Support Equipment LSF Laboratory Simulation Facility LSFE Life Sciences Flight Experiment LSI Large Scale Integration LSID Launch Sequence and Interlock Document LSM Life Science Module LSMI Logistics Support Management Information LSO Landing Support Officer LSO Large Solar Observatory LSP Least Significant Portion LSPDF Life Science Payloads Development Facility LSR Launch Site Recovery LSR Land Sea Rescue LSRM Life Science Research Module LSS Landing, Separation Simulator LSS Life Support Subsystem LSSL Life Sciences Space Laboratory LSSF Life Sciences Support Facility LSSM Launch Site Support Manager LSSP Launch Site Support Plan LSSR Landing Site Support Review LSSRC Life Sciences Shuttle Research Centrifuge LSST Launch Site Support Team LST Large Space Telescope LST Large Stellar Telescope LST Launch Support Team LST Liquid Storage Tank LST Local Standard Time LSTE Launch Site Transportation Equipment LSU Life Support Umbilical LT Lead Time LT Left LT Light LTA Lower Torso Assembly LTD Limited LTD Lift-to-Drag LTG Lighting LTG Linear Tangent Guidance LTM Lead Time Matrix LUB Lubricate LUS Liquid Upper Stage LUT Launcher-Umbilical Tower LV Launch Vehicle LV Lift Vector LV Limit Value LV Load Vertical LV Loading Valve LV Low Voltage LVDC Launch Vehicle Digital Computer LVDT Linear Variable Differential Transformer LVDT Linear Voltage Differential Transformer LVL Level LVLH Local Vertical/Local Horizontal LW Launch Window LWD Launch Window Display LWD Left Wing Down LWG Logistics Working Group LWHS Light-Weight Headset LWR Lower LWS Lightning Warning System LWT Launch Window Time LWT Light Weight Tank (Shuttle-C ET) M M Mach M Maintainability M Major Cycle M Male M Mandatory M Manual M Mass M Matrix M Mega M Mercury M Middle M Million M Missing (Data) M Monitor (MON preferred) M Number of Revolutions Required for the Rendezvous m Meter M&C Maintenance and Checkout M&C Monitor and Control Panel M&F Materials and Facilities M&M Materials and Maintenance M&O Maintenance and Operations M&P Materials and Processes M&P Materials and Processing M&R Maintenance and Refurbishment M&R Maintenance and Repair M&RF Maintenance and Refurbishing Facility M&RO Maintenance and Refurbishment Operations M+R Maintenance and Refurbishment M+R Maintenance and Repair M- Time in Days Before Move Operations m-kg Meter-Kilogram M-M-L-S Model-Modes-Loads-Stresses M/F Maintenance Factor M/I Minimum Impulse M/L Maintenance Loop M/LR Maintenance Loop Recorder M/P Main Parachute M/R Mixture Ratio (Fuel to Oxidizer) M/S Measurement Stimuli M/SCI Mission/Safety Critical Item M/U Mockup M50 Mean of 1950 (Coordinate System) MA Maintenance (STS) MA Maintenance Ability MA Martin Ablator MA Master MA Master Alarm MA Material Authorization MA Metabolic Analyzer MA Middeck Act MA Mike Amplifier MA Missed Approach MA Mission Analysis MA Mission Assignment MA Multiple Access mA Milliampere MA&P Maintenance Analysis and Planning MA&T Manufacturing Assembly and Test MAA Mathematical Association of America MAA Maximum Authorized Altitude MAA Mechanical Arm Assembly MAAB Materials Application Advisory Board MAAR Monthly Associate Administrator's Review MAB Master Acquisition Bus MAB Materials Advisory Board MAB Materials Applications Board MAB Mechanical Automation Breadboard MAB Missile Assembly Building MAC Main Display Console MAC Maintenance Advisory Committee MAC Maximum Allowable Concentration MAC Maximum Concentration of Organics MAC Mean Aerodynamic Chord MAC Military Airlift Command MAC Multiaccess Computer MACDS Monitor and Control Display System MACE Mechanical Antenna Control Electronics MACH Machine MACH Velocity Relative to the Speed of Sound MACI Monitor, Access, and Control Interface MACO Major Assembly Checkout MACRO Merge and Correlate Recorded Output (Program) MAD Madrid, Spain (STDN) MAD Maintenance Analysis Data MADC Multiplexer Analog to Digital Converter MADRE Manufacturing Data Retrieval System MADS Modeling and Analysis Data Set MADS Modular Auxiliary Data Systems MAEP Minimum Autoland Entry Point MAF Manpower Authorization File MAF Michoud Assembly Facility MAF Mixed Amine Fuel MAG Magazine MAG Magnetic MAG Magnitude MAGSAT Magnetometer Satellite MAI Machine-Aided Indexing MAIDS Management Automated Information Display System MAIDS Multipurpose Automatic Inspection and Diagnostic System MAIN Maintenance MAINT Maintenance MAIR Manufacturing and Inspection Record MAJ Major MAL Malfunction MAL Material Allowance List MAL Mobile Airlock MALL Malleable MAN Manual MAN Microwave Aerospace Navigation MANF Manifold MAOT Maximum Allowable Operating Time MAP Maintenance Analysis Program MAP Message Acceptance Pulse MAP Mission Application Program MAP Missed Approach Point MAPOLE Magnetic Dipole Spark Transmitter MAPS Measurement of Air Pollution from Satellites MAPS Measurement of Atmospheric Pollution from Satellites MAR Maintenance Action Request MAR Maintenance and Refurbishment MAR Memory Address Register MARGO Manned Apollo Recovery Ground Optics MARS Martin Automatic Reporting System MARS Modular Airborne Recorder System MASDC Military Aircraft Storage and Disposition Center MAT Matrix MAT Meteorological Atmospheric Turbulence MAT Multiple Actuator Test MATCO Materials Analysis, Tracking, and Control MATE MDM Application Test Environment MATL Material MAU Million Accounting Units MAUS Messenschafteliche Autonome Experiment Unter Schewerelosigkeit MAX Maximum MAXCO Maximum Dynamic Pressure MB Main Bus MB Management Baseline MB Millibar MB/S Megabits per Second MBAC Marshall Booster Assembly Contractor mbar Millibar MBB Messerschmitt-Boklow-Blahn MBC Maximum Breathing Capacity MBCS Motion-Base Crew Station (SMS) MBFP Manufacturing Build and Flow Plan MBI Multibus Interface MBK Medications and Bandage Kit MBL Mobile Unit (TACAN Station) MBO Management by Objective MBPS Megabits Per Second MBPS Million Bits Per Second MBS Mobile Base System MBV Main Base Visit MC Memory Configuration MC Midcourse Correction Maneuver MC Mission Capability MC Mission Completion/Continuation MC&C Measurement, Command, and Control MC&W Master Caution and Warning MCA Master Control Assembly MCA Maximum Crossing Altitude MCA Monitoring and Control Assembly MCA Motor Control Assembly MCA Multichannel Analyzer MCBF Mean Cycle between Failures MCC Main Combustion Chamber MCC Mission Control Center (JSC) MCC Motor Control Center (JSC) MCC-DOD Mission Control Center-DOD MCC-H Mission Control Center-Houston MCC-K Mission Control Center-Kennedy MCC-NASA Mission Control Center-NASA MCCC Mission Control and Computing Center MCCS Mission Control Center Simulation (System) MCDS Maintenance Control and Display System MCDS Multifunction CRT Display System MCDU Multifunction CRT Display Unit MCE Mechanism Control Electronics MCF Maintenance and Checkout Facility MCF Major Component Fail MCF Mission Control Facility MCIU Manipulator Controller Interface Unit MCIU Master Control and Interface Unit MCIU Mission Control and Interface Unit MCL Mass Change Log MCL Master Configuration List MCLT Maximum Cruise Level Thrust MCM MADS Control Module MCN Master Change Notice MCO Mission Control Center MCOP Mission Control Operations Panel MCP Master Change Proposal MCP Master Computer Program MCP Materials Control Plan MCP Measurements Control Procedure MCP Mission Control Programmer MCP Monitoring and Control Panel MCPC Manipulator Controller Power Conditioner MCPS Major Cost Proposal System MCR Master Change Record MCS Maintenance and Checkout Station MCS Measurements Calibration System MCT Maximum Climb Thrust MCT Mission Control Table MCU Master Control Unit MCU Mission Control Unit MCVP Materials Control and Verification Program MCW Modulated Continuous Wave MD Biomedical Office (KSC Directorate) MD Malfunction Detection MD Manual Direct MD Manual Disconnect MD Master Dimension MD Microdot MD Mission Director MDA Main Distribution Assembly MDA Maintainability Design Approach MDA Middeck Assembly (FDF) MDA Missile Defense Agency MDA Motor Drive Amplifier MDA Multiple Docking Adapter MDAC McDonnell Douglas Astronautics Company MDAR Malfunction Detection, Analysis, and Recording MDAS Meteorological Data Acquisition System MDAS Mission Data Acquisition System MDB Mission Data Book MDC Main Display Console MDC Mission Director Center MDC Mission Duty Cycle MDCA Main Distribution Control Assembly MDCS Maintenance Data Collection System MDCS Malfunction Display and Control System MDCS Master Digital Command System MDCS Material Data Collection System MDD Mate/Demate Device MDDS Material Directory Data Sheet MDE Mission Dependent Equipment MDE Mission Dependent Experiment MDE Modular Display Electronics MDF Main Distribution Frame MDF Mild Detonating Fuse MDF Manipulator Development Facility MDF Mating/Demating Facilities MDL Master Data Library MDM Manipulator Deployment Mechanism MDM Medical Monitor MDM Multiplexer/Demultiplexer MDR Maintenance Demand Rate MDR Major Design Review MDR Minor Discrepancy Repair MDR Mission Data Reduction MDR Missing Data Report MDR Monthly Director's Review MDRD Mission Data Requirements Document MDRS Manufacturing Data Retrieval System MDRS Mission Data Retrieval System MDS Malfunction Detection System MDS Management Data System MDS Master Development Schedule MDS Minimum Discernible Signal MDS Minimum Discernible System MDS Mission Development Simulator MDS Motion Detection System MDSD Mate/Demate Stiffleg Derrick MDT Maintenance Demand Time MDT Mean Detonating Time MDT Mean Down Time MDT Measurement Descriptor Table MDT Mountain Daylight Time MDTSCO McDonnell Douglas Technical Services Company ME Main Engine ME Management Engineering ME Miscellaneous Equipment MEA Main Electronics Assembly MEA Maintenance Engineering Analysis MEA Materials Experiment Assembly MEAR Maintenance Engineering Analysis Request MEAS Measuring, Measurement MEB Main Electronics Box MEBO Main Engine Burnout MEC Engine Mounted Computer MEC Main Engine Controller MEC Master Event Controller MEC Materials Experiment Carrier MEC Mission Events Controller MECA Main Engine Controller Assembly MECCA Master Electrical Common Connector Assembly MECF Main Engine Computational Facilities MECH Mechanical MECO Main Engine Cutoff MECR Maintenance Engineering Change Request MED Manual Entry Device MED Medical MED Medium MEDEA Material Science Experiment Double Rack for Experiment Modules and Apparatus (Spacelab D-1 Experiment) MEDICS Medical Information Computer System MEDS Multifunction Electronic Display Subsystem (glass cockpit) MEE Mission Essential Equipment MEG Megohm MEI Master Inspection Item MEIG Main Engine Ignition MEIT Multi Element Integration Testing MEIU Main Engine Interface Unit MEL Master Equipment List MEL Minimum Equipment List MEL Modular Electromagnetic Levitator MELEO Material Exposure in Low Earth Orbit MELI Master Equipment List Index MELI Minimum Equipment List Index MEM Meteoroid Exposure Module MEM Module Exchange Mechanism MEMS MicroElectroMechanical Systems MEOP Maximum Expected Operating Pressure MEP Main Engine Propellant MEP Main Entry Point MEP Management Engineering Program MEP Mean Effective Pressure MEP Minimum Entry Point MEQA&P Mission, Environmental, Quality Assurance & Policy MER Mars Exploration Rover MER Meridian MER Mission Evaluation Room MERB Materials and Engineering Review Board MERL Materials Engineering Research Laboratory MERL Materials Equipment Requirement List MERSAT Meteorology and Earth Observation Satellite MERU Milliearth Rate Unit MES Main Engine Start MES Mated Elements Simulator MES Mated Events Simulator MES Mission Events Sequence MESA Marshall Engineers and Scientists Association MESA Miniature Electrostatic Accelerometer MESA Modular Equipment Stowage Assembly MESA MSFC Engineering Support Area MESC Master Events Sequencer Controller MESSENGER Mercury Surface, Space ENvironment, GEochemistry and Ranging MET Master Events Timer MET Meteorological MET Mission Elapsed Time MET Mission Events Timer META Megachannel Extraterrestrial Assay METRO Meteorology METVC Main Engine Thrust Vector MEWG Maintenance Engineering Working Group MF Midfuselage MF Mate and Ferry MF Major Function MF Master Frame MF Medium Frequency (300 to 3000 kHz) MF Middeck Forward MFA Manned Flight Awareness MFBP Manufacturing Flow and Building Plan MFC Multiple Flight Computer MFC Multiple Flight Controller MFD Main Feed MFD Malfunction Detection MFE Mid Frequency Executive MFF MDM Flight Forward MFG Major Functional Group MFG Manufacturing MFMR Multifrequency Microwave Radiometer MFO Major Function Overlay MFR Manipulator Foot Restraint MFR Multifunctional Review MFR Maximum Flight Rate MFR Multifunctional Receiver MFT Mean Flight Time MFTAD Master Flight Test Assignment Document (JSC) MFV Main Fuel Valve MG Middle Gimbal (YAW) MG Mobile Generator Mg Magnesium mg Milligram MGA Middle Gimbal Angle MGC Manual Gain Control MGE Maintenance Ground Equipment MGMT Management MGR Manager MGSE Mechanical Ground Support Equipment MGT Major Ground Test MGVT Mated Ground Vibration Test MHA Multiple Headset Adapter MHC Manipulator Hand Controller MHD Multihead Disc MHE Material Handling Equipment MHF Medium High Frequency MHSC Manipulator Handset Controller MHW Multihundred Watt MHz Megahertz (Megacycles per Second) MI Management Information mi Mile MIA Mission Implementation Agreement MIA Multiflex Interface Adapter MIA Multiplexer Interface Adapter MIB Master Interconnect Board MIC Management Information Center MICIS Material Information Control and Information System MICOM Missile Command (Army) MICS Management Information and Control System MID Maximo/Documentum Interface MID Midbody MIE Mechanical Integration Engineer MIL Military MIL GSFC Spaceflight Tracking and Data Network Station MILA Merritt Island Launch Area MILS Missile Impact Location System MILSTRIP Military Standard Requisition and Issue Procedure MIMOSA Mission Modes and Space Analysis MIMS Medical Information Management System MIN Minimum min Minute MINW Master Interface Network MIO Management Integration Office MIOS Multi-IMU Operation System MIP Modification Instruction Package MIP Mandatory Inspection Point MIP Minimum Impulse Pulse MIP MMU Integration Plan MIPR Military Intergovernmental Purchase Request MIPS Merritt Island Press Site MIR Malfunction Investigation Report MIR Mirror MIS Management Information System MIS Mission Information Subsystem MISC Miscellaneous MISS Mission MISSE Materials International Space Station Experiment MIT Massachusetts Institute of Technology (CSDL) MIT Master Instruction Tape MITS Marshall Integrated Telecommunications System MITTS Mobile Igor Tracking Telescope System MIU MPE Interface Unit MIU Multiplex Interface Unit MIUL Materials Identification and Usage List MIUS Modular Integrated Utility Systems MJ Mechanical Joint MJCA Midbody Jettison Control Assembly MJS Manipulator Jettison System (Subsystem) MK Mark MKTI Mission Kit Technical Instruction ML Middeck Left ML Mobile Launcher ML Mold Line ML PED Mobile Launcher Pedestal MLA MDM Launch Aft MLA Monochrome Lens Assembly MLB Multilayer Board MLC Mobile Launcher Computer MLF MDM Launch Forward MLG Main Landing Gear MLGS Microwave Landing Guidance System MLI Multilayer Insulation MLL MDM Launch Left MLP Mobile Launch (Launcher) Platform MLR MDM Launch Right MLR Monodisperse Latex Reactor MLRS Monodisperse Latex Reactor System MLS Microwave Landing System MLW Maximum Landing Weight MLX Merritt Island, FL (STDN Site, Second Antenna) MM Main Memory MM Main Module MM Major Mode MM Man-Month MM Mass Memory MM Math Model MM Mission Manager mm Millimeter MMA Mass Memory Assembly MMACS Maintenance Management and Control System MMACS Maintenance, Mechanical Arm, and Crew System Engineer MMAG Martin Marietta Astronautics Group MMAS Material Management Accounting (Accountability) System MMC Martin Marietta Corporation MMC Mid Motor Controller MMC Mission Management Center MMCA Midbody Motor Control Assembly MMCL Master Measurement and Control List MMDB Mass Memory Data Base MMDB Master Measurement Data Base MMDF Mission Model Data File MMES MSFC Mated Element Systems MMH Maintenance Man-Hour MMH Monomethylhydrazine MMH Monomethyl hydrazine MML Master Measurement(s) List MMLS Model-Modes-Loads-Stresses MMOS Multimode Optical Sensor MMPSE Multiuse Mission Payload Support Equipment MMS Mission Modular Spacecraft MMS Modular Multiband Scanner MMS Multimission Modular Spacecraft MMSE Multiuse Mission Support Equipment MMT Mass Memory Test MMT Mission Management Team MMU Manned Maneuvering Unit MMU Mass Memory Unit MN Main MNA,B,C Main Bus A, B, or C MNVR Maneuver MO Major Objective MO Manned Orbiter MO Manual Orientation MO Manufacturing Order MO Mars Observer MO Master Oscillator MO Middeck Overhead MO Mission Operations MO Move Mo Molybdenum MOA Make on Arrival MOA Memorandum of Agreement MOA Minute-of-Angle MOAR MPLM Overhead Access Rig MOC Marine Operation Center MOC Missions Operations Center MOC Mission Operations Computer MOCF Mission Operations Computational Facilities MOCR Mission Operations Control Room MOCS Multichannel Ocean Color Sensor MOCV Manual O2 Control Valve MOD Mission Objectives Document MOD Mission Operations Directorate MOD Modification MOD Modify MOD Modulation, Modulator MOD Module, Modular MODART Methods of Defeating Advanced Radar Threats MODB Master Object Data Base MODEM Modulator-Demodulator MODLAN Mission Operations Division Local Area Network MODS Mission Oerations and Data System MODS Modifications MOF Manned Orbital Flight MOL Molecular MOM Mission Operations Manager MOM Moment MON Monitor MOP Mission Operations Plan MOPI Max Rate Output Initiator MOPR Mission Operations Planning Review MOPR Mission Operations Planning Room MOPS Military Operations Phone System MOPS Mission Operations Planning System MOR Manufacturing Operation Record MOR Mission Operations Record MORD Medical Operations Requirements Document MORD Mission Operations Requirements Document MORT Management Oversight and Risk Tree MOS Metal Oxide on a Substrate MOS Metal Oxide Semiconductor MOS Mission Operations System MOSPO Mobile Satellite Photometric Observatory MOT Motor MOU Memorandum of Understanding MOV Main Oxidizer Valve MOVA Main Oxidizer Valve Actuator MOW Mission Operations Wing MOWG Mission Operations Working Group MP Management Package MP Mass Properties MP Measuring Point MP Medium Pressure MP Melting Point MP Meteorology Panel MP Mission Planner MP Mod Package MP&C Maintenance Planning and Control MPA Mass Processing Analysis MPAD Mission Planning and Analysis Division (JSC) MPB Maintenance Parts Breakdown MPC Manual Pointing Controller MPC Memory Protection Check MPC Meteorological Prediction Center MPC Mid Power Controller MPC Midbody Pyro Controller MPCA Mid Power Controller Assembly MPD Main dc Power Distributor Assembly MPD Maximum Permissible Dose MPE Mission Peculiar Experiment MPESS Mission Peculiar Experiment Support Structure MPG Multipoint Grounding MPG Multiple Point Ground MPGHM Mobile Payload Ground Handling Mechanism MPHE Material and Personnel Handling Equipment MPI Mission Payload Integration MPIIN Modification Procurement Instrument Identification Number MPIO Mission Payload Integration Office MPL Maintenance Parts List MPL Manipulation Positioning Latches MPL Mechanical Parts List MPL Minimum Power Level (65 percent) MPLM Multi-Purpose Logistics Module MPLN Maintenance Planning (Data Base) MPM Manipulator Positioning Mechanism MPM Materials Properties Manual MPMP Mass Properties Management Plan MPMSE Multiuse Payload and Mission Support Equipment MPP Material Processing Procedure MPPSE Multipurpose Payload Support Equipment MPR Maintainability Problem Report MPR Management Program Review MPR Mockup Purchase Request MPS Main Propulsion System (Subsystem) MPS Master Program Schedule MPS Material Processing Specification MPS Material Processing System MPS Materials Processing in Space MPS Megabits per Second MPS Mission Planning System MPS Modular Power System MPSR Mission Profile Storage and Retrieval MPSR Multipurpose Support Room MPSS Main Parachute Support Structure MPSS Mission Planning and Scheduling System MPSS Multiple Payload Support Structure MPST Multipurpose Support Team MPT Main Propulsion Test MPTA Main Propulsion Test Article MPTF Main Propulsion Test Facility MPTP Main Propulsion Test Program MPTS Multipurpose Tool Set MPVA Main Propellant Valve Actuator MR Main Ring MR Master Reset MR Material Review MR Mission Report MR Mixture Ratio MRA Main Ring Assembly MRA Mechanical Readiness Assessment MRB Material Review Board MRC Material Review Crib MRC Measurement Requirements Committee MRCR Measurement Requirement Change Request MRD Mission Requirements Document MRD Material Review Disposition MRDR Material Review Disposition Record MRF Maintenance Responsibility File MRF Maximum Retarding Force MRF Measurements/Stimuli Request Form MRI Measurement Requirements and Interface MRI Moderate Resolution Imager MRIR Medium Resolution Infrared Radiometer MRL Manipulator Retention Latches MRL Manipulator Retention Lock MRL Material Requirements List MRR Mission Reconfiguration Request MRS Management Review System MRTC Multiple Real-Time Commands MS Machine Screw MS Machine Steel MS Man System MS Margin of Safety MS Mass Spectrometer MS Master Switch MS Material Specification MS Materials Science MS Mating Sequence and Control MS Milestone MS Military Standard (Parts Designation) MS Mission Specialist MS Mission Station MS Multistring ms Millisecond MS/MS Material Science and Manufacturing in Space MSA Minimum Surface Area MSA Material Service Area MSA MSA-1 MSAD Materials Summary Acceptance Document MSAT Multiflow Schedule Assessment Team MSB Most Significant Bit MSBLS Microwave Scanning Beam Land Station MSBLS Microwave Scanning Beam Landing System MSBLS-GS MSBLS Ground Station MSC Manned Spacecraft Center (changed to JSC) MSC Master Sequence Controller MSC Materials Service Center MSC Military Sealift Command MSC Mobile Servicing Center MSC Moding Sequencing and Control MSCC Manned Systems Control Center MSCI Mission Scientist MSCR Measurement/Stimuli Change Request MSD MARS Supplemental Data MSDS Material Safety Data Sheet(s) MSDS Multispectral Scanner and Data System MSE Maintenance Support Equipment MSE Measuring and Stimuli Equipment MSE Mechanical Support Equipment MSE Medical Support Equipment MSE Mission Staff Engineer MSEC Master Separation Events Controller msec Millisecond (ms preferred) MSF Maintenance Source File MSF Manned Space Flight MSFC George C. Marshall Space Flight Center MSFC Marshall Space Flight Center MSFN Manned Space Flight Network MSFP Manned Space Flight Program MSG Mechanical Subsystem Group MSG Message MSG Mission Support Group MSI Maintenance Significant Items MSI Medium Scale Integration MSIA Multispectral Image Analyzer MSID Measurement Stimulation identification MSK Manual Select Keyboard MSL Missile MSL Mechanical System(s) Laboratory MSL Mean Sea Level MSLD Mass Spectrometer Leak Detector MSM Manned Support Module MSN Mission MSO Model for Spare(s) Optimization MSOB Manned Spacecraft Operations Building (O&C preferred) MSOCC Multisatellite Operations Control Center MSOIN Minor Subcontractor or IDWA Notification MSR Module Support Rack MSS Maintenance Status System MSS Manufacturers Standardization Society MSS Mechanical Support Systems MSS Mission Specialist Staton MSS Mission Status Summary MSS Mobile Service Structure MSS Multispectral Scanner System MSSTA Multispectra Solar Telescope Array MST Measurement Status Table MST Mission Sequence Test MST Mobile Service Tower MST Module Service Tool MST Module Systems Trainer MST Mountain Standard Time MSTR Master MSU Mass Storage Unit MSU Measuring Stimuli Units MSV Monitored Sine Vibration (Test) MSVP Master Shuttle Verification Plan MSW Microswitch MSWG Materials Science Working Group MT Magnetic Tape MT Master Timer MT Master Tool MT Maximum Torque MT Mean Time MT Mechanical Technician MT Metering Truss MT Mission Time MT Mission Trajectory MT Mobile Transporter MT Mount MT Mountain Time MTA Magnetic Torquer Assembly MTA Maintenance Task Analysis MTA Major Test Article MTA Marshall Trowelable Ablator MTA Mass Thermal Analysis MTB Materials Testing Branch MTBD Mean Time between Demand MTBF Mean Time between Failure MTBM Mean Time between Maintenance MTBMA Mean Time between Maintenance Action MTBR Mean Time between Replacement MTC Man-Tended Capability MTC Manual Traffic Control MTC Master Thrust Control MTC Master Thrust Controller MTC Mission and Traffic Control MTCA Monitor and Test Control Area MTCU Magnetic Tape Control Unit MTD Mounted MTDSK Magnetic Tape Disk MTE Multisystem Test Equipment MTE Maintenance Test Equipment MTEC Maintenance Test Equipment Catalog MTEE Electrical Maintenance Test Equipment MTEEC Electronic Maintenance Test Equipment MTEF Fluid Maintenance Test Equipment MTEM Maintenance Test Equipment Module MTEM Mechanical Maintenance Test Equipment MTEO Optical Maintenance Test Equipment MTF Mississippi Test Facility (now NSTL) MTFO Modular Training Field Option MTG Mounting MTGP Monitor Table Generator Program MTGW Maximum Total Gross Weight MTK Mechanical Time Keeping MTL Material MTL Main Transfer Line MTLP Monitor Table Listing Program MTM Methods Time Measurement MTO Modification Task Outline MTO Magnetic Tape Operator MTO Master Timing Oscillator MTO Maximum Time Out MTO Mission, Task, Objective MTOGW Maximum Takeoff Gross Weight MTOW Maximum Takeoff Weight MTP Master Test Plan MTP Manufacturing Technical Procedure MTP Mission Test Plan MTR Motor MTR Magnetic Tape Recorder MTS Metric Time System MTS Master Timing System MTS Magnetic Tape Station (System) MTT Maximum Touch Temperature MTTA Mean Time to Accomplish MTTE Mean Time to Exchange MTTF Mean Time to Failure MTTFF Mean Time to First Failure MTTR Mean Time to Repair MTU Magnetic Tape Unit MTU Master Timing Unit MTU Mobile Training Unit MTVC Manual Thrust Vector Control MTW Maximum Taxi Weight MU Master Unit MU Mobile Unit MU Mockup MU Multiple Unit MUA Material(s) Usage Agreement MUA Maximum Usable Altitude MUF Maximum Usable Frequency MULE Multi-Use Lightweight Equipment MULT Multiple MULT Multiply MUM Mass Memory Unit Manager MUMS Multiple Use Marc System MUR Manpower Utilization Report MUSAT Canadian Government Satellite MUSS Module Utility Support Structure MUX Multiplex, Multiplexer MV Manual Valve MV Manufacturing Verification mV Millivolt MVA Main Valve Actuator MVA Megavolt Ampere MVAS Multipurpose Ventricular Actuating System MVC Manual Volume Control MVC Master Volume Control MVF Manned Vertical Flight MVGVT Mated Vertical Ground Vibration Test MVI Microgravity Vestibular Investigation MVM Mariner Venus/Mercury MVP Master Verification Plan MVR Maneuver MVS Middle Value Select MVS Multiple Virtual Storage MVT Mission Verification Test MW Man Week MW Microwave mW Milliwatt MWB Master Work Book MWG Maintenance Analyzer Working Group MWP Maximum Working Pressure MWPE Mental Workload and Performance MWPR Monthly Work Package Report MWR Mean Width Ratio MWS Molecular Wake Shield MWV Maximum Working Voltage MX Multiplex MY Man Year MYTA Maintainability Task Analyses MYVAL Maintainability Evaluation MZFW Maximum Zero Fuel Weight N N Neutrons N Newton N North N2 Nitrogen N2H4 Hydrazine N2HO4 Nitrogen Peroxide N2O4 Nitrogen Tetroxide N&G Navigation and Guidance (G&N preferred) N/A Next Assembly N/A Not Applicable N/B Narrow Band N/C Non-Concur N/C Normally Closed N/C Nose Cone N/C Not Critical N/C Numerical Control N/D Need Date N/O Normally Open N/P Not Provided N/W Network NA Next Action NA Not Applicable NAAL North American Aerodynamic Laboratory (Wind Tunnel) NAC Nacelle NACA National Advisory Committee for Aeronautics NAEC Naval Air Engineering Center NAFIS NASA Accounting and Financial Information Center NAICS North American Industry Classification System NAM National Association Of Manufacturers NAOO National Oceanic and Atmospheric Administration NAP Navigation Analysis Program NAR Numerical Analysis Research NARC North American Rockwell Corporation NARS National Archives and Record Services NAS National Academy of Sciences NAS National Aircraft Standard NAS Naval Air Station NASA National Aeronautics and Space Administration NASCAD NASA Computer Aided Design NASCOM NASA Communications (Network) NASDA National Space Development Agency (of Japan) NASP National Aerospace Plane NASTRAN NASA Structural Analysis NATF Naval Air Test Facility NATL National NAV Navigate, Navigation NAVAID Navigation Aid NAVDAD Navigationally Derived Air Data NAVEX Navigation Experiments (Spacelab D-1 Experiment) NAVPOOL Navigation Parameter Common Pool NAVSAT Navigation Satellite NAVSTAR Navigational Star NB Narrow Band NB Navigation Base NB Neutral Buoyancy NB Nitrogen Base NB No-Bias (Relay) Nb Niobium NBF Neutral Buoyancy Facility NBL Neutral Buoyancy Laboratory NBS National Bureau of Standards NBS Neutral Buoyancy Simulator NBT Neutral Buoyancy Trainer NC National Course NC No Change NC No Comment NC Noise Criteria NC Normal Corrective Maneuver NC Normally Closed NC Numerical Control NC1 Nominal Correction 1 (Phasing Maneuver) NCAR National Center for Atmospheric Research (National Science Foundation Research Center) NCC NASA Class Code NCC Network Control Center (GSFC) NCC Nominal Corrective Combination (Maneuver) NCC Normal Corrective Combination (Maneuver) NCFI North Carolina Foam Insulation NCGS Nuclear Criteria Group Secretary NCI Phasing Maneuver NCIU Network Common Interface Unit NCOS National Commission on Space NCR No Calibration Required NCR Nonconformance/Failure Report NCS Near Infrared Camera & Multi-Object Spectrometer (NICMOS) Cooling System NCS Nutation Control System ND NASA Document Nd Neodymium NDE Nondestructive Evaluation NDI Nondestructive Inspection NDT Nondestructive Test NDTF Nondestructive Test Facility NDTL Nondestructive Test Laboratory NEA Noise Equivalent Angle NEB Network Engineering Branch NEBA NASA Employee Benefit Association NEC National Electrical Code NEC Nippon Electric Company NEEDS NASA End-To-End Data System NEG Negative NEMS NASA Equipment Management System NEO Near-Earth Object NEP Normal Entry Point NEPA National Environmental Protection Act NESC NASA Engineering and Safety Center NESC National Electrical Safety Code NESR Natural Environment Support Room NET NASA Employee Team NET Network (N/W preferred) NET No Earlier Than NETCOM Network Communications NEWMAST National Education Workshop for Math and Science Teachers NEXT NASA Exploration Team NEXUS NASA Engineering Extendible United Software System NF Natural Flood NF Noise Figure NFCS Nuclear Forces Communications Satellite NFPA National Fire Protection Association NFS Nozzle Flow Sensor NFSP Nonflight Switch Panel NFW Nonfuel Wasting NG Narrow Gage NG Nitrogen Gage NG Nose Gear NGM Nitrogen Generation Module NGT NASA Ground Terminal NH Nominal Height (Adjust Maneuver) NH Nominal Height Adjustment Maneuver NH3 Ammonia NH4 Hydrazine NHA Next Higher Assembly NHB NASA Handbook NHC National Hurricane Center Ni Nickel NI-SIL Nickel-Silver NIA NOVA Interface Adapter NIAT NASA Integrated Action Team NIB Noninterference Basis NIC Not in Contract NICD Nickel Cadmium NIDS Network Interface Data System NIL No Limit (NL preferred) NIM Nuclear Instrumentation Module NIP Network Input Processor NIP Network Interface Processor NIP Nipple NISN NASA Integrated Services Network NJP Network Job Processing NL No Limit NLA Next Lower Assembly NLG Nose Landing Gear NLT Not Later Than NLT Not Less Than NM Nautical Miles NM Network Manager (GSFC) NM Nonmetallic nm Nanometer NMA National Management Association NMAB National Materials Advisory Board NMC National Meteorological Center NMI NASA Management Instruction NMI Nautical Miles NMO Normal Manual Operation NMR Nuclear Magnetic Resonance NMT Not More Than NMT Notification of Master Tool NMV Nitrogen Manual Valve NNI-I NASA Standard Initiator-Type I (was SMSI) NO Nitric Oxide NO Normally Open NO Not for Off-KSC Distribution No. Number NO2 Nitrogen Dioxide NOAA National Oceanic and Atmospheric Administration NOC Notation of Content NOC Network Operation Control NOC Not Otherwise Coded NOCC Network Operations Control Center NOCR Network Operations Control Room NOES National Operational Environmental Satellite Serv. NOM Network Output Multiplexer NOM Nominal NOR Normal NOR Northrup Flight Strip, NM (Deorb OPT site) NORAD North American Air Defense Command NORDSAT Scandinavian Countries Broadcast Satellite NORM Normal NOSL Night/Day Optical Survey of Thunderstorm Lightning NOSP Network Operations Support Plan NOSS National Oceanic Survey Satellite NOZ Nozzle NP Neptunium NP Network Program NP Not Provided NPC NASA Publication Control NPC Nitrogen Purge Control NPC Normal Plane Change Maneuver NPD NASA Policy Directive NPD Nominal Percent Defective NPDS Nuclear Particle Detection Subsystem NPL Normal Power Level (see RPL) NPLD NASA Payloads Logistics Depot NPN NASA Part Number NPRV Nitrogen Pressure Relief Valve NPS NASA Planning Studies NPSH Net Positive Suction Head NPSP Net Positive Static Pressure NPSP Net Positive Suction Pressure NPU Nitrogen Purge Unit NPV Nitrogen Pressure Valve NR Noise Rating NR Nose Right NR Not Required NR/T Near Real-Time NRC National Research Council NRC Nonrecurring Costs NRCC National Research Council of Canada NRI Nonrecurring Investment NRL Naval Research Laboratory NRM Nonrecurring Maintenance NRO National Reconnaissance Office NRP Normal Rated Power NRS Nonconformance Reporting System NRT Near Real-Time NRTS Not Repairable at This Station NRZ Non-Return-to-Zero NRZ-L Non-Return-to-Zero Level NS Nickel Steel NS Not Switchable NS Nuclear Shuttle NSA National Standards Association NSD NASA standard detonator NSGT NASA Ground Terminal NSI-I NASA Standard Initiator-Type I (was SMSI) NSLD NASA Shuttle Logistics Depot NSN National Stock Number NSO NASA Support Operation NSP NASA Support Plan NSP Network Signal Processor NSR Nominal Slow Rate NSR Normal Slow Rate (Maneuver) NSR National Slow Rate NSR1 First Coelliptic Maneuver NSR2 Second Coelliptic Maneuver NSS Nitrogen Supply Subsystem NSSDC National Space Science Data Center NSTL National Space Technology Laboratory (was MTF) NSTL National Space Technology Laboratories NSW NSP Status Word nt Newton NTD NASA Test Director NTIS National Technical Information Service NTO Nitrogen Tetroxide NTP Network Test Panel NTP Normal Temperature and Pressure NTP Notice To Proceed NTR Nuclear Thermal Rocket NTS Not to Scale NTS Near Term Schedule NTSO NASA Test Support Office NTTF Network Test and Training Facility NUL Non-GSE Utilization List NVAFB North Vandenberg Air Force Base NVB Navigational Base NVPOWG NASA/VAFB Payload Operations Working Group NVR No Voltage Release NVR Nonverification Required NVR Nonvolatile Residue NW NASA Waiver NW Nose Wheel NWS National Weather Service NWS Nose Wheel Steering NWSA Nose Wheel Steering Amplifier NWSI New World Services Inc. NWT Nonwatertight NWW Nose Wheel Well NX Normal to X-Axis NX Nose to X-Axis NY Normal to Y-Axis NY Nose to Y-Axis NZ Normal Acceleration NZ Normal Load Factor (g) NZ Normal to Z-Axis NZ Nose to Z-Axis NZB Non Zero Binary O O Omicron O Out O2 Oxygen O&C Operation and Checkout O&C Operation(s) and Checkout (Building--was MSOB) O&C Operations and Control O&FS Operations and Flight Support O&IA Operations and Integration Agreement O&M Operation and Maintenance O&P Operations and Procedures O&R Overhaul and Repair O-NAV Onboard Navigation O/B Onboard O/B Operational Base O/C Operations Critical O/D On Dock O/D Outside Diameter O/E Output Electronics O/ET Orbiter/External Tank O/F Oxidizet-to-Fuel Ratio O/L Overload O/L-RC Overload-Reverse Current O/O On Orbit O/R Outside Radius O/R Oxygen Relief O/V Overvoltage O/V-U/V Over Voltage/Under Voltage OA Office of Applications (now OSTA) OA Operational Aft (DSC or MOM) OA Operational Instrumentation MDM-Aft OA Orbital Assembly OA Output Axis OA Overall OAA Orbiter Access Arm OAA Orbiter Alternate Airfield OAA Orbiter access arm OAET Office of Aeronautics, Exploration, and Technology OAFD Orbiter Air Flight Deck OAFTO Orbiter Atmospheric Flight Test Office OAL Overall Level OALC Ogden Air Logistics Center OAMS Orbital Attitude and Maneuvering System OANS Orbiter Ancillary OAO Orbiting Astronomical Observatory OART Office of Advanced Research and Technology OAS Office Automation System OAS Orbiter Aeroflight Simulator OAS Orbiter Atmospheric Simulator OAS Orbiter Avionics System OASCB Orbiter Avionics Software Control Board OASIS Oceanic and Atmospheric Scientific Information System OASPL Overall Sound Pressure Level OAST Office of Aeronautics and Space Technology (now OAET) OAT Operational Acceptance Test OAT Overall Test OB Onboard OB Operational Base OB Optical Bench OB Outboard OBC Onboard Computer OBCO Onboard Checkout (Instrumentation) OBCS Onboard Checkout Subsystem OBS Observe, Observer OBS Operational Bioinstrumentation System OBS Operational Biomed Sensors OBS Operational Biomedical System OBSS Orbiter Boom Sensor System OBV Oxidizer Bleed Valve OC On Center OC On-Condition OC Open Circuit OC Operations Controller OC Operations Coordinator OC Orbital Check OC Overcurrent OCALC Oklahoma City Air Logistics Center OCC Office of Contract Compliance OCC Operations Control Center OCD Operational Capability Development OCDR Orbiter Critical Design Review OCDU Optics Coupling Data Unit (G&N) OCE Ocean Color Experiment OCE Optical Control Electronics OCF Onboard Computational Facility OCF Orbiter Computational Facilities OCGF Organic Crystal Growth Laboratory Facility OCH Orbiter Common Hardware OCM Organic Content Monitor OCN Order Control Number OCO OMS Cutoff OCO Open-Close-Open OCP Output Control Pulse OCR Optical Character Recognition OCRM Orbiter Crash and Rescue Manuals OCS Onboard Checkout System OCS Optical Control System OCT Octal, Octave OD Operations Directive OD Operational Downlink/Downlist OD Outside Diameter OD Oxygen Drain ODB Operational Data Book ODC Other Direct Costs ODCDR Orbiter Delta CDR ODDS Operational Data Delivery Services ODES Optical Discrimination Evaluation Study ODF Orbit Determination Facility ODIN Orbital Design Integration (System) ODIN Outsourcing Desktop Initiative for NASA/KSC ODP Operational Display Procedure ODR Output Data Redundancy ODRAN Operational Drawing Revision Advance Notice ODS Orbiter Docking System ODU Output Display Unit OEAS Orbital Emergency Arresting System OECO Outboard Engine Cutoff OEM Original Equipment Manufacturer OES Orbiter Emergency Site OESS Orbiter/ET Separation Subsystem OEX Orbiter Experiments OF Operational FWD DSC or MDM OF Operational Instrumentation MDM-FWD OF Orbital Flight OF Outside Face OF Oxidizer-to-Fuel Ratio OF Oxygen Fill OFCC Office of Federal Contract Compliance OFD Organizational Focus Day OFDS Orbiter Flight Dynamics Simulator OFDS Oxygen Fluid Distribution System OFI Operational Flight Instrumentation OFI Opportunity for Improvement OFK Official Flight Kit OFK Optical Flight Kit OFM Original Equipment Manufacturer OFP Operational Flight Profile OFP Operational Flight Program OFP Orbiter Flight Program OFS Orbital (Orbiter) Flight System OFS Orbiter Functional Simulator OFT Orbital Flight Test OFTDS Orbital Flight Test Data System OFTM On-Orbit Flight Technique Meeting OFTR Orbital Flight Test Requirement OG Outer Gimbal (Roll) OG Oxygen Gage OG Zero Gravity OGA Outer Gimbal Angle OGA Outer Gimbal Axis OGE Operating Ground Equipment OGMT Orbiter Greenwich Mean Time OGS Outer Glideslope OGS Oxygen Generation System OGV Oxygen Gage Valve OH Overhaul OH Overhead OHA Operational Hazard Analysis OHA Orbital Height Adjustment Maneuver OHC Onboard Hard Copier OHC Optics Hand Controller OHF Occupational Health Facility OHGVT Orbiter Horizontal Ground Vibration Test OHMM Ohmmeter OHP Agency Occupational Health Program (Principal) (http://ohp.ksc.nasa.gov/) OI Operational Instrumentation OI Operations Interface OI Orbiter Insertion OI Orbiter Instrumentation OIA Orbiter Interface Adapter OIA Office of International Affairs OIB Orbiter Interface Box OIC Orbiter (Orbital) Integrated Checkout OIL Operations Integration Instruction OIR Operations Integration Review OIS Operational Intercommunication System OIS Orbiter Insertion Stage OIS Orbiter Instrumentation Systems OISR Open Item Status Report OISSP Office of Interim Space Station Program OIT Orbiter Integrated Test OIV Oxidizer Isolation Valve OIVS Orbiter Interface Verification Set OJT On-the-Job Training OL Open Loop OL Operational Left DSC or MDM OL Overlay OL Overload OLDB On-Line Data Bank OLF Orbiter Landing Facility (now SLF) OLF Orbiter Lifting Frame OLIF Orbiter Landing Instrumentation Facilities OLOW Orbiter Lift-Off Weight OLSA Orbiter/LPS Signal Adapter OLSP Orbiter Logistics Support Plan OM Operational Mid DSC or MDM OM Optical Master OM Outer Marker (ILS) OMA Operations Maintenance Area OMA Operations Management Application OMA Orbiter Maintenance Area OMB Office of Management and Budget OMBUU Orbiter Midbody Umbilical Unit OMC Operations Management Center OMC Orbiter Maintenance and Checkout OMCF Operations and Maintenance Control File OMCF Orbiter Maintenance and Checkout Facility OMD Operations and Maintenance Documentation OMD Orbiter Mating Device OMDP Orbiter Maintenance Depot OMDP Orbiter Maintenance Down Period OMD P&P Operations Maintenance Documentation Planning and Production OMDR Operations and Maintenance Data Record OMDR1 Operations and Maintainability Data Record OME Orbital Main Engine OME Orbital Maneuvering Engine OME Orbiter Main Engine OMET Orbiter Mission Elapsed Time OMEWG Orbiter Maintenance Engineering Working Group OMI Operations and Maintenance Instruction OMIS Operational Management Information System OMISS Operation and Maintenance Instruction Summary Sheet(s) OML Orbiter Mold Line OML Outer Mold Line OML Outside Mold Line OMM Orbiter Major Modification OMMH Orbiter Maintenance Man-Hours OMNI Omni-Range OMNI Omnidirectional OMP Operations and Maintenance Plan OMPR Operational Maintainability Problem Reporting OMPT Observed Mass Point Trajectory OMR Orbiter Management Review OMR Operations Management Room OMR Operations and Maintenance Requirements OMRB Operating Material Review Board OMRC Operational Maintenance Requirements Catalog OMRF Orbiter Modification and Refurbishment Facility OMRP Operations and Maintenance Requirements Plan OMRS Operations and Maintenance Requirements Specification OMRSD O&M Requirements and Specification Documentation OMRSD Operational Maintainability Reporting Systems Document OMRSD Operations and Maintenance Requirements and Specifications Document OMS Operations Management System OMS Orbital Maneuvering System (Subsystem) OMSF Office of Manned Space Flight (now OSTS) OMSP Operational Maintenance Support Plan OMU Optical Measuring Unit OMV Orbital Maneuvering Vehicle OMV Oxygen Manual Valve ONBD Onboard ONBT Orbiter Neutral Buoyancy Trainer OND Operator Need Date ONR Office of Naval Research OOD Orbiter On-Dock OODP Out-of-Detent Pitch OODR Out-of-Detent Roll OOMM Organizational Operations and Maintenance Manual OOP Out of Position OOS On-Orbit Station OOS Orbit-to-Orbit Shuttle OOS Orbit-to-Orbit Stage OOSDP On-Orbit Station Distribution Panel OOT Out of Tolerance OP Open OP Operate OP Operation OP Oxygen Purge OPA Operations Planning Analysis OPB Oxidizer Preburner OPBOV Oxidizer Preburner Oxidizer Valve OPDAR Optical Detection and Ranging OPE Other Project Element OPER Operation OPER Operations, Operate, Operator OPF Orbiter Processing Facility OPFC Orbiter Preflight Checklist OPGUID Optimum Guidance (Technique) OPI Orbiter Payload Interrogator OPIDF Operational Planning Identification File OPIS Orbiter Prime Item Specification OPL Open Problem List OPL Operational OPLF Orbiter Processing and Landing Facility OPNS Operational Phase OPO Orbiter Project(s) Office OPOV Oxidizer Preburner Oxidizer Valve OPP Opportunity OPP Opposite OPPAR Orbiter Project(s) Parts Authorization Request OPPL Orbiter Project Parts List OPR Office of Primary Responsibility OPR Operations Planning Review OPR Operator OPR Orbiter/Payload Recorder OPR Oxygen Pressure Regulator OPRV Oxygen Pressure Relief Valve OPS Operational Sequence OPS Operations OPS Operations Sequence OPS Orbiter Project Schedules OPS Oxygen Purge System OPSB Orbiter Processing Support Building OPSR Operations Supervisor (GSTDN Site) OPSS Orbital Propellant Storage Subsystem OPT Operational Pressure Transducer OPT Optics OPT Optimum OPT Option OPTB Operational Program Time Base OPTB Opposite OR Operational Right OR Operations Requirement OR Operations Review OR Operations Room OR Outer Roll OR Oxygen Relief ORB Orbit, Orbital, Orbiter ORB Order ORB 1-g Orbiter one-g (trainer) ORCHIS Oak Ridge Computerized Hierarchical Information System ORD Operational Readiness Date ORD Operational Ready Data ORD Operational Requirements Document ORD Orbital Requirements Document ORD Ordnance ORDC Orbiter Data Reduction Center ORE On-Orbit Repair Experiment ORF Orifice ORG Organization ORI Operational Readiness Inspection ORIDE Override ORIEN Orientation ORIG Origin ORLA Optimum Repair Level Analysis ORMR Orbiter Rollout Milestone Review ORP OFS Retransmission Processor ORR Operational Readiness Review ORR Operations Requirements Review ORS Orbital Refueling System ORS Orroval Valley, Australia (STDN) ORSDI Oak Ridge Selective Dissemination of Information ORT Orbit Readiness Test ORT Operational Readiness Test ORTHOG Orthogonal ORU Orbital Replacement Unit OS On-Orbit Station OS Operating Software OS Operating System OS Optics Subsystem OS Orbital Servicing OS Orbiter CEI Specification OSA Operational Support Area OSC Operations Support Center OSC Orbital Sciences Corporation OSC Oscillator OSCRS Orbital Spacecraft Consumables Resupply System OSDH Orbiter System Definition Handbook OSE Orbital Support Equipment OSE Orbiter Support Equipment OSE Operating Support Equipment OSF Office of Space Flight (now OSTS) OSF Ordnance Storage Facility OSHA Occupational Safety and Health Act (Activity) OSHA Occupational Safety and Health Administration OSLM Operations Shop/Lab Manager OSM Orbital Service Module OSMP Operational Support Maintenance Plan OSO Ocean Systems Operation OSO Orbiting Solar Observatory OSOP Orbiter Systems Operating Procedures OSP Operations Support Plan OSR Operations Support Room OSS OEX Support System OSS Office of Space Science OSS Office of Space Station OSS Optics Subsystems OSS Orbiting Space Station OSSA Office of Space Science and Applications OSSRH Orbiter Subsystem(s) Requirements Handbook OST Operations Support Team (GSFC) OST Orbiter Support Trolley OSTA Office of Space and Terrestrial Application(s) OSTDS Office of Space Tracking and Data Systems OSTO Office of Space Transportation Operations OSTP Orbiting System Test Plan OSTS Office of Space Transportation Systems OT Operating Time OT Operational Instrumentation MDM-Tank OT Operational Test OT Operational Trajectory OT Optical Tracker OT Out Temperature OT Overtime OT&E Operational Test and Evaluation OTA Optical Telescope Assembly OTB Orbiting Tanker Base OTBD Outboard OTC Orbiter Test Conductor OTD Operational Technical Documentation OTD Orbiter Test Director OTDA Office of Tracking and Data Acquisition (now OSTDS) OTEMP Overtemperature OTH Over-the-Horizon (Radar) OTK Oxidizer Tank OTL Ordnance Test Laboratory OTLC Orbiter Timeline Constraints OTO One-Time-Only OTOS Orbit-to-Orbit Stage OTP Operational Test Procedure OTP Operations Test Plan OTP Operations Turnaround Plan OTR Operating Time Record OTR Outer OTS Off-the-Shelf OTS Orbiter Test Conductor OTT Optional Team Targeting OTV Operational Television OTV Orbiter Transfer Vehicle OUP OFS Uplink Processor OUT Orbiter Utilities Tray OUT Outlet OUT Output OUTBD Outboard OV Orbiter Vehicle OV Oxygen Vent OVBD Overboard OVCO Operational Voice Communication Office OVF Overfill OVFL Overflow OVHD Overhead OVHT Overheat OVI Operational Validation Inspection OVLD Overload OVRD Override OVS Operational Voice System OVV Overvoltage OW Optical Window OWD One-Way Doppler OWDE One-Way Doppler Extraction OWF Optimum Working Frequency OX Oxidizer OXD Oxide, Oxidizer OXDZR Oxidizer OXID Oxidizer OXY Oxygen OZ Ozone oz Ounce P P Pallet (Spacelab) P Period P Pilot P Pitch P Pole P Pressure P Primary P Prime P Roll Rate (Angular Rate) P&FS Particles and Fields Subsatellite P&I Performance and Interface (Specification) P&M Performance Monitor P&M Phase Modulation (Modulated) P&M Planetary Mission P&M Preventive Maintenance P&M Processes and Materials P&M Program Milestone P&M Pulse Modulation P&R Performance and Resources P&SM Procurement and Subcontract Management P&W Pratt and Whitney P-BAND 225 to 390 MCS P-P Peak-to-Peak (Value) P-TUBE Pneumatic Tube P-WEAR Preliminary Work Breakdown Structure Element Audit Review P/A Problem Analysis P/B Pushbutton P/B Preburner P/C Pitch Control P/L Parts List P/L Payload P/L Postlanding P/L Purchased Labor P/N Part Number P/P Patch Panel P/P Printer/Plotter P/PL Primary Payload P/S Payload Specialist P/S Parallel to Serial Converters P/Y Pitch/Yaw P1 Port 1 PA Pad Abort PA Paging and Area Warning PA Power Amplifier PA Product Assurance PA Public Address PA Public Affairs PA Pulse Amplifier PAC Pressure Alpha Center PAC Probe Aerodynamic Center PAC Problem Action Center PACAS Personnel Access Control Accountability System PACC Problem Action Control Center PACE Prelaunch Automatic Checkout Equipment PACS Pointing and Attitude Control System PAD Preliminary Advisory Data (Crew Data Uplink) PAD Program Approval Document PAD Propellant Acquisition Device PAE Preventive Action Engineer PAE Problem Assessment Engineer PAF Payload Attach Fitting PAF Peak Annual Funding PAFB Patrick Air Force Base PAH Payload Accommodations Handbook PALAPA Indonesian Communications Satellite PALS Photo Area and Location System PALS Precision Approach and Landing System PAM Payload Assist Module PAM Pulse Amplifier Modulation PAM Pulse Amplitude Modulation PAM-A PAM, Atlas-Centaur Class Spacecraft PAM-D PAM, Delta Class Spacecraft PAMB Pressure Ambient PAO Public Affairs Office (Officer) PAP Product Assurance Plan PAPI Precision Approach Path Indicator PAR Planning Action Request PAR Precision Approach Radar PAR Problem Accountability Record PAR Problem Action Record PAR Problem Action Request PAR Product Acceptance Review PARA Paragraph PARAM Parameter PARS Property Accountability Record System PAS Payload Accommodation Studies PAS Primary Ascent System PASS Planning and Scheduling System PASS Primary Avionics Software System PAT Problem Action Team PAT Production Acceptance Test PATP Preliminary Authority To Proceed PATS Program for Analysis of Time Series PAU Probe Aerodynamic Upper PAV Pneumatic Actuated Valve PAV Pressure Actuated Valve PAX Passengers PAYCOM Payload Command PAYCOM Payload Command Controller PAYDAT Payload Data PB Phonetically Balanced PB Playback PB Preburner (P/B preferred) PB Pushbutton PBAN Polybutadiene Acrylonitrile (Propellant) PBD Payload Bay Door PBDF Payload Bay Door FWD PBDM Payload Bay Door Mechanism PBI Push Button Indicator PBIC Programmable Buffer Interface Card PBIM Programmable Buffer Interface Module PBK Payload Bay Kit PBL Payload Bay Liner PBM Power Balance Model PBM Program Business Management PBMA Process-Based Mission Assurance PBP Preburner Pump PBPS Post-Boost Propulsion System(s) PBS Protective Breathing System PBW Proportional Band Width PC Personal Computer PC Pitch Control PC Plane Change PC Planetary Camera PC Power Converter PC Pressure Chamber PC Printed Circuit (Card) PC Project Control PC Pulsating Current PCA Payload Clamp Assembly PCA Physical Configuration Audit PCA Pitch Control Assembly PCA Pneumatic Control Assembly PCA Point of Closest Approach PCA Power Control Assembly PCA Primer Carrier Assembly PCA Primer Chamber Assembly PCA Pyrotechnic Carrier Assembly PCASS Program Compliance Assurance and Status System PCB Power Circuit Breaker PCB Power Control Box PCB Printed Circuit Board PCB Product Configuration Baseline PCC Pad Control Center PCC Payload Control and Checkout PCC Production Control Centers PCCB Program Configuration Control Board PCCE Payload Common Communication Equipment PCCM Program Change Control Management PCCN Provisioning Contract Control Number PCCP Preliminary Contract Change Proposal PCD Procurement Control Document PCDU Payload Command Decoder Unit PCEM Propulsion Contamination Effects Module PCF Payload Control Facility PCG Phonocardiogram PCG Protein Crystal Growth PCG2 Personal Computer Government Operator Aerospace Language 2 PCGE Protein Crystal Growth Experiment PCGOAL Personal Computer Government Operator Aerospace Language PCH Program Critical Hardware PCI Peripheral Controller Interface PCI Procedure Change Unit PCI Production Configuration Identification PCI Program Control Input PCIL Pilot-Controlled Instrument Landing PCIN Program Change Identification Number PCIN Program Change Incorporation Notice PCIN Program Change Integration PCL Pallet Coolant Loop PCL Power Control List PCL Primary Coolant Line PCL Primary Coolant Loop PCL Programming Check List PCM Power Control Mission PCM Pulse Code Modulation PCM Pulse Code Modulator PCM Punch Card Machine PCME Pulse-Code Modulation Event PCMD Pulse-Code Modulation, Digital PCME Pulse-Code Modulation Event PCMMU PCM Master Unit PCMMU Pulse-Code Modulation Master Unit PCMS Pulse-Code Modulation Shared PCN Page Change Notice PCN Program Change Notice PCN Program Control Number PCO Postcheckout PCO Postcheckout Operations PCO Procuring Contracting Officer PCO Program Controlled Output PCOT Payload Center Operations Team PCP Power Control Panel PCP Program Change Proposal PCP Project Change Proposal PCP Project Cost Plan PCR Payload Certification Review PCR Payload Changeout Room PCR Payload Checkout Room PCR Power Change Request PCR Program Change Request PCR Project Control Room PCR Publication Change Request PCRB Program Change Review Board (RI Launch Operations) PCS Payload Checkout System PCS Payload Control Supervisor PCS Pointing Control System PCS Portable Computer System PCS Power Conversion System PCS Pressure Control System PCS Primary Coolant System PCS Procedure Completion Sheet PCT Percent PCTC Payload Crew Training Complex PCTE Portable Commercial Test Equipment PCTO Payload Cost Tradeoff Optimization PCTR Pad Connection Terminal Room PCU Payload Checkout Unit PCU Power Control Unit PCU Pressure Control Unit PCU Process Control Unit PCV Precheck Verification PCV Purge Control Valve PCVB Pyro Continuity Verification Box PCVL Pilot Controlled Visual Landing PCZ Physical Control Zone PD Pitch Down PD Preliminary Design PD Procurement Document PD Procurement Drawing PD Program Directive PD Project Directive PD Propellant Dispersal PD&RS Payload Deployment and Retrieval Subsystem PDA Power Distribution Assembly PDA Preliminary Design Audit PDA Propellant Drain Area PDAR Program Description and Requirements PDB Performance Data Book PDB Power Distribution Box PDB Project Data Base PDC Predefined Command PDC Procurement Document Change PDCR Proprietary Data Control Record PDCS Power Distribution and Control System (Subsystem) PDF Pocket Dosimeter FEMA PDH Pocket Dosimeter-High PDI Payload Data Interleaver PDIP Program Development Integration Plan PDL Pocket Dosimeter-Low PDL Procedure Distribution List PDL Program Design Language PDM Processor Data Monitor PDM Pulse Duration Modulation PDM/FM Pulse Duration Modulation/Frequency Modulation PDMR Program Director's Management Review PDMS Payload Database Management System PDP Plasma Diagnostics Package PDP Postinsertion Deorbit Preparation PDP Postinsertion Deorbit Prep Checklist PDP Preliminary Definition Plan PDP Procurement Data Package PDP Program Development Plan PDP Project Definition Phase PDR Preliminary Data Requirements PDR Preliminary Design Review PDR Process Description Report PDR Processed Data Recorder PDR Processed Data Ring PDR Program Design Review PDR Program Director's Review PDRD Procurement Data Requirements Document PDRL Procurement Data Requirements List PDRM Payload Deployment and Retrieval Mechanism PDRS Payload Data and Retrieval System PDRS Payload Deployment and Retrieval System(s) PDRSS Payload Development and Retrieval System Simulator PDRSTA Payload Deployment and Retrieval System Test Article PDS Package Data System PDS Partitioned Data Set PDS Power Distribution System (Subsystem) PDS Problem Data System PDSS Payload Data System Services System PDU Performance Diagnostic Unit PDU Pilot Display Unit PDU Power Drive Unit PDU Pressure Distribution Unit PDU Pulse Detection Unit PDV Pressure Disconnect Valve PE Perkin Elmer PE Project Engineer PEAP Personal Egress Air Packs PEB Performance Evaluation Board PED Payload Element Developer PED Pedal PED Pedestal PED Platform Equipment Deck PEFO Payload Effects Follow-on Study PEG Powered Explicit Guidance PEHG Payload Ethernet Hub Gateway PEIR Project Equipment Inspection Record PEL Precision Elastic Limit PEM Plant Engineering and Maintenance PEN Penicillin PEP Performance Evaluation Profile PEP Power Extension Package PER Perigee PER Period PER Preliminary Engineering Report PERD Payload Element Requirements Document PERF Perform, Performance PERM Permanent PERT Program Evaluation Review Technique PES Post Ejection Sequencer PET Phase Elapsed Time PETA Performance Evaluation and Trend Analysis PETB Preflight Test Bus PETN Petaerythrite Tetranitrate PETS Payload Environmental Transportation System PETS P/L Experiment Test System (KSC) PETS POCC Experiments Timeline System (GDSD and Spacelab) PF Parachute Facility PF Payload Forward PF Payload Function PF Payload Operational Instrumentation MDM-FWD PF Power Factor PF Powered Flight PF Preflight PF Prime Function PF Probability of Failure PF Pulse Frequency PFA Palmdale Final Assembly PFB Payload Feedback PFB Payload Forward Bus PFB Position Feedback PFB Pressure Fed Booster PFC Performance Flight Certification PFC Postflight Checkout PFC Power Factor Corrector PFC Preflight Certification PFC Preliminary Flight Certification PFCF Payload Flight Control Facility PFCS Primary Flight Control System PFK Payload Function Key PFL Primary Freon Loop PFM Platform PFM Pulse Frequency Modulation PFP Program Financial Plan PFP Programmable Functional Panel PFR Portable Foot Restraint PFRT Preliminary Flight Rating Test PFRX Preflight Relmat (X-1,2,3...9 or A,B,C...Z) PFS Percent Full Scale PFS Primary Flight System PFTA Payload Flight Test Article PG Power Generation PG Pressure Gage PGA Power Generating Assembly PGA Pressure Garment Assembly PGA Programmable Gain Amplifier PGC Plant Growth (unit) PGC Plant Growth Chamber PGCP Particles and Gases Contamination Panel PGDCS Power Generation, Distribution, and Control Subsystem PGE Purge PGHM Payload Ground Handling Mechanism PGM Program(able) PGNCS Primary G&N and Control System (Subsystem) PGOR Payload Ground Operation Requirements PGORS Payload Ground Operations Requirements Study PGOWG Payload Ground Operations Working Group PGR Spacelab Planning and Ground Rule PGRWG Payload Ground Requirements Working Group PGS Power Generation Subsystem PGSE Payload Ground Support Equipment PGSM Payload Gimbal Separation Mechanism PGU Plant Growth Unit PGWG Particles and Gasses Working Group PH Personal Hygiene PH Phase pH Hydrogen-Ion Concentration (Alkalinity) PHA Preliminary Hazard Analyses PHA Pulse Height Analyzer PHARM Predictive Health and Reliability Management PHCF Pituitary Growth Hormone Cell Function PHF Payload Handling Fixture PHF Personal Hygiene Facility PHK Personal Hygiene Kit PHM Per Hundred Million PHMC Probe Heater Motor Controller PHOTO Photograph PHOTO Photography of Mexico PHOTONS Photometric Thermospheric Oxygen Nightglow Study PHP Payload Handling Panel PHR Payload Hazardous Report PHS Payload Handling Station PHS&T Packaging, Handling, Storage, and Transportation PHSF Payload Hazardous Servicing Facility (KSC) PI Payload Interrogator PI Pen and Ink (Document Update) PI Preliminary Investigation PI Principal Investigator PI Procurement Item PI Program Introduction PIA Preinstallation Acceptance PIA Project Impact Analysis PIA Project Initiation Agreement PIAR Project Impact Analysis Report PIB Pyrotechnic Installation Building PIC Payload Integration Center PIC Payload Integration Committee PIC Preinstallation Checkout PIC Programmable Interval Clock PIC Pyro Ignition Control PIC Pyro Initiator Capacitors PIC Pyro Initiator Controller PIC Pyrotechnic Initiator Controller PICA Pyrotechnic Initiator Control Assembly PICP Program Interface Control Plan PICRS Program Information Control and Retrieval System PICRS Program Information Coordination and Review Service PICS Photo Index and Cataloging System PICS Predefined Input Control Sequence PID Parameter Identification PID Payload Insertion Device PID Program Information Document PID Program Introduction Document PIDA Payload Installation and Deployment Aid PIDS Portable Image Display System PIE P/L Integration Equipment PIECP Preliminary Impact Engineering Change Proposal PIF Payload Integration Facility PIGA Pendulous Integrating Gyro Accelerometer PII Procurement Instrument Identification PIIN Procurement Instrument Identification Number PIM Pulse Interval Modulation PIND Particle Impact Noise Detection PIO Payload Integration Plan PIO Pilot-Induced Oscillation PIO Public Information Office PIP Payload Integration Plan PIP Payload Interface Plan PIP Plant Instrumentation Program PIP Production Instrumentation Package PIP Project Implementation Plan PIPA Pulse Integrating Pendulum Accelerometers PIPA Pulse Integrating Pendulum Assembly PIRN Preliminary Interface Revision Notice PIT Preinstallation Test PITG Payload Integration Task Group PITS Payload Integration Test Set PIU Power Interface Unit PIU Pyrotechnic Initiator Unit PIV Peak Inverse Voltage PK Peak (Valve) PK/PK Peak to Peak PKD Programmable Keyboard and Display PKG Package PKM Perigee Kick Motor PKT Pocket PL Payload (P/L preferred) PL Plate PL Plug PL Postlanding (P/L preferred) PL Prelaunch PL/SNSR Payload Sensor PLA Parachute Location Aid PLACE Position Location Aircraft Communications Equipment PLAK PLM Late Access Kit PLAT Platform PLB Payload Bay PLB Payload Bay PLBD Payload Bay Door(s) PLBK Playback (PB preferred) PLD Program Listing Document PLDI Payload Data Interleaver PLDM Payload Management PLDS Payload Support PLGSS Payload Ground Support Systems PLH Payload Handling PLI Payload Interrogator PLISN Provisioning List Item Sequence Number PLL Phase Locked Loop PLM Payload Management PLM Payload Monitoring PLMS Program Logistics Master Schedule PLN Plan PLN Program Logic Network PLRD Payload Requirements Document PLRV Payload Launch Readiness Verification PLS Payload Systems PLS Post Landing and Safing PLS Preliminary Landing Site PLS Primary Landing Site PLS Propellant Loading System PLSL Propellants and Life Support Laboratory PLSP Payload Signal Processor PLSS Portable Life Support Subsystem PLSS Portable Life Support System PLSS Primary Life Support Subsystem PLT Pilot PLTS Precision Laser Tracking System PLUM Payload Umbilical Mast PLV Postlanding Vent PLVC Postlanding Vent Control PM Payload Management PM Payload Midbody PM Performance Monitor PM Phase modulation, phase modulated PM Preventive Maintenance PM Project Manager PM Pulse Modulation PMA Performance Monitor Annunciator PMA Pressurized Mating Adapter PMAD Performance Monitor Annunciation Driver PMAD Power Management and Distribution PMAP Performance Monitor Annunciation Panel PMAT Page Map Address Table PMC Payload Monitoring and Control PMC Plutona-Molybdenum Cermet PMC Postmanufacturing Checkout PMC Private Medical Communication PMC Procurement Method Code PMD Palmdale (TACAN Station) PMDL Palmdale, California PMEL Precision Measurements Equipment Laboratory PMF Performance Monitor (Monitoring) Function PMF Perigee Motor Firing PMF Program Management Facility PMHL Preferred Measurement Hardware List PMI Preventive Maintenance Inspection PMI Preventive Maintenance Instruction PMI Principal Maintenance Inspector PMIA Parallel Multiplexer Interface Adapter PMIR Program Manager's Integration Review PMIS Personnel Management Information System PML Preliminary Materials List PMM Property Management Manual PMN Program Management Network PMN Program Model Number PMOM Performance Management Operations Manual PMON Performance Management Operations Network PMP Parts, Materials, and Processes PMP Performance Management Package PMP Premodulation Processor PMP Program Management Plan PMP Pump PMPL Preferred Mechanical Parts List PMR Performance Measurement Report PMR Program Manager's Review PMS Performance Management System PMS Performance Measurement System PMS Performance Monitoring System PMT Planning/Management Team PMT Production Monitoring Test PMTC Pacific Missile Test Center PMU PCM Master Unit PMU Pressure Measuring Unit PMU Pulse Modulation Unit PN Part Number (P/N preferred) PN Pseudo Noise PN Pseudo-Random Noise PNEU Pneumatic PNL Panel PNP Prenegotiation Position PO Personnel Office (KSC Directorate) PO Postorbit PO Purchase Order POA Plan of Action POC Payload Operations Center POC Point of Contact POC Purchase Order Closeout POCC Payload Operations Control Center POCN Purchase Order Change Notice POD Payload Operations Director POD Payload Operations Division (JSC) POD Probability of Detection POD Proximity Opticai Device POE Pilot Operational Equipment POGO Pogo Suppression System POGO Polar Orbiting Geophysical Observatory POI Product of Inertia POI Propellant Quantity Indicator POL Petroleum, Oil, and Lubricants POLAR Production Order Location and Reporting POM Pallet-Only Mode POM Printer Output Microfilm POMT Planning Operations Management Team POP Perpendicular-to-Orbit Plane POP Polar Orbiting Platform POP Preburner Oxidizer Pump POP Preflight Operations Procedures POP Prelaunch Operations Plan POP Program Operating Plan POPA Payload Ordnance Processing Area POPU Push Over Pull Up POR Point of Resolution POR Purchase Order Request PORB Production Operations Review Board PORCN Production Order Records Change Notice PORD Performance and Operations Requirements Document PORR Preliminary Operations Requirements Review PORT Portable POS Pacific Ocean Ship POS Portable Oxygen System POS Position POST Payload Operations Support Team POST Positive POST Program to Optimize Simulated Trajectories POT Potable POT Potentiometer POV Peak Operating Voltage POV Pneumatic Operated Valve POWS Project Operating Work Statement PP Partial Pressure PP Planning Package PP Power Pole PP Program Performance PP Push-Pull PPB Parts per Billion (p/b preferred) PPB Program Performance Baseline PPC Phased Provisioning Code PPC Preprocessing Center PPCO2 Partial Pressure CO2 PPEP Plasma Physics and Environmental Perturbation PPF Payload Processing Facility (USAF) PPH Pounds per Hour PPI Plan Position Indicator PPI Pulse Position Indicator PPIL Priced Provisioned Item List PPL Provisioning Parts List PPL Priced Parts List PPL Planning Parts List PPM Parts per Million PPM Part per Minute PPM Pulse per Minute PPM Pulse Position Modulation PPME Pacific Plate Motion Experiment PPO2 Partial Pressure O2 PPO2 Oxygen partial pressure PPP Payload Patch Panel PPP Peak Pulse Power PPP Programmable Power Processor PPR Payload Preparation Room PPS Pneumatic Power Subsystem PPS Printer/Plotter System PPS Provisioning Performance Schedule PPS Pulse Per Second PQGS Propellant Quantity Gaging System PR Pair PR Payload Recorder PR Performance Report PR Position Record PR Pressure PR Pressure Ratio PR Pressure Regulator PR Primary PR Problem Report PR Procurement Regulation PR Procurement Requisition PR Pulse Rate PR Purchase Request PRA Probabilistic Risk Assessment PRAB Program Risk Assessment Board PRACA Problem Reporting and Corrective Action PRB Panel Review Board PRB Parachute Refurbishment Building PRB Paso Robles (TACAN Station) PRB Project Review Board PRC People's Republic of China (Payload) PRC People's Republic of China Satellite PRC Planning Research Corporation PRCA Problem Reporting and Corrective Action PRCB Program Requirements Change Board PRCB Program Requirements Control Board PRCB Program Review Control Board PRCBD Program Requirements Control Board Directive PRCBD Program Review Control Board Directive PRCU Payload Rack Checkout Unit PRD Personal Radiation Dosimeter PRD Procurement Regulation Directive PRD Procurement Requirements Document PRD Program Requirements Documents (UDS) PRE Personal Rescue Enclosure PRE-MOD Premodulation PREAMP Preamplifier PREF Preference PREFLT Preflight PREL Preliminary PREP Preparation PREP Prepare PRES Present PRESS Pressurant PRESS Pressure PREV Previous PREVLV Prevalve PRF Parachute Refurbishment Facility PRF Pulse Repetition Frequency PRI Primary PRIM Primary PRL Page Revision Log PRL Priority Rate Limiting PRM Payload Retention Mechanism PRM Posigrade Rocket Motor PRM Pulse Rate Modulation PRN Program Release Notice PRN Pseudo-Random Noise PRN Pulse Range Navigation PRO Proceed PROB Problem PROC Procurement PROC Procedure PROC Processor, Process PROG Progress PROG Program PROJ Project PROM Programmable Read-Only Memory PROP Propellant PROP Proportioning PROP Propulsion PROP Propulsion Engineer PROPLT Propellant PROX Proximity PRP Personnel Reliability Program PRPS Programming Requirements Process Specification PRR Parts Replacement Request PRR Preliminary Requirements Review PRR Program Requirements Review PRR Pulse Repetition Rate PRS Payload Retention Subsystem PRS Payload Rotation Stand PRS Personnel Rescue Service PRS Personnel Rescue System PRS Power Reactant System (Subsystem) PRS Precision Ranging System PRS Primary Recovery Site PRS Primary Rescue Site PRS Provisioning Requirements Statement PRSD Power Reactant Storage and Distribution PRSD Power Reactant Supply and Distribution PRSDS Power Reactant Storage and Distribution System PRSS Problem Report Squawk Sheet PRT Pulse Repetition Time PRTLS Powered Return to Launch Site PRV Pressure Reduction Valve PS Parachute Subsystem PS Payload Specialist PS Payload Station PS Payload Support PS Power Supply PS Pressure Switch PS Prime Select PS/FC Power Supply/Fuel Cell PSA Payload Service Area PSA Payload Support Avionics PSA Power Servo Amplifier PSA Power Servo Assembly PSA Pre/Post Sleep Activity PSA Preferred Storage Area PSA Pressure Switch Assembly PSA Provisions Stowage Assembly PSAC Presidential Scientific Advisory Committee PSC Parallel Switch Control PSC Program Schedule Chart PSCL Propellant Systems Cleaning Laboratory PSCN Preliminary Specification Change Notice PSD Power Spectral Density PSD Program Support Document PSDP Payload Station Distribution Panel PSDR Planning and Scheduling Document Record PSE Payload Service Equipment PSE Payload Servicing Equipment PSE Payload Support Equipment PSE Peculiar Support Equipment PSF Payload Servicing Structure PSF Point Spread Function PSF Processing and Staging Facility (SRB) PSF Processing and Storage Facility (ET) psf Pounds Per Square Foot (lb/ft2 preferred) PSFC Power Supply/Fuel Cell PSG Power Subsystem Group PSI Power Static Inverter psi Pounds Per Square Inch (Static Pressure) (lb/in2 preferred) psia Pounds Per Square Inch Absolute psid Pounds Per Square Inch Differential PSIG Propulsion Systems Integration Group psig Pounds Per Square Inch Gauge psis Pounds Per Square Inch Sealed PSK Phase Shift Keyed PSL Perpendicular to the Sun Line PSL Pressure Seal PSL Propellant Seal PSM Phase Sensitive Modulator PSM Propellant Storage Module PSM Pyro Substitute Monitor PSN Purge Sequence Number PSOP Payload Systems Operating Procedures PSP Payload Signal Processor PSP Payload Specialist Panel PSP Payload Support Plan PSP Program Support Plan PSP Project Schedule Plan PSPA Pressure Static Probe Assembly PSPL Priced Spare Parts List PSR Pre-Shipment Review PSR Program Status Review PSRD Program Support Requirements Document PSS Pad Safety Supervisor PSS Payload Specialist Station PSS Payload Support System PSS Propellant Supply Subsystem PSS Propulsion Support System PSSA Payload Support Structural Assembly PSSP Payload Specialist Station Panel PSST Periodic Significant Scheduled Tasks PSSU Patch Survey and Switching Unit PSTF Payload Spin Test Facility PSU Power Sensor Unit PSU Power Switching Unit PSV Planetary Space Vehicle PSW Program Status Word PT Advanced Planning and Technology Office (KSC Dir.) PT Part Time PT Pint PT Pitch Trim PT Point PT Pressure Transducer PTA Post-Test Analysis PTA Potential Toxic Area PTA Propulsion Test Article PTB Payload Timing Buffer PTC Passive Thermal Control PTC Payload Training Complex PTC Portable Temperature Controller PTCR Pad Terminal Connection Room PTCS Passive Thermal Control Section PTCS Passive Thermal Control System PTCS Payload Test and Checkout System PTCS Planning, Training, and Checkout System PTCS Propellant Tanking Computer System PTD Provisioning Technical Documentation PTDDSS PTD Data Selection Sheet PTF Payload Training Facility PTFE Polytetrafluorethylene PTI Preliminary Test Information PTI Pre-Programmed Test Input PTI Programmed Test Input PTIS Program Test Input System PTM Pulse Time Modulation PTMS Precision Torque Measuring System PTO Participating Test Organizations PTO Power Test Operations PTP Point-to-Point Phone(s) PTR Preliminary Test Report PTR Printer PTR Program Trouble Report PTS Payload Test Set PTS Payload Transportation System PTT Push-to-Talk PTV Pathfinder Test Vehicle PTVS Portable Test and Verification System PU Pickup PU Power Unit PU Propellant Unit PU Propellant Utilization PUB Publication PUCS Propellant Utilization Control System PUGS Propellant Utilization and Gaging System PUPO Pull Up Push Over PUSS Pallet Utility Support Structure PUV Propellant Utilization Valve PV Prevalve PV&D Purge, Vent, and Drain PVA Preburner Valve Actuator PVA Propellant Valve Actuator PVD Purge, Vent, Drain System PVR Precision Voltage Reference PVRD Purge, Vent, Repressurize, and Drain PVRO Pyrotechnics PVT Physical Vapor Transport PVT Preflight Verification Test PVT Pressure, Volume, and Temperature PVT Pressure/Volume/Temperature PVT Private PVT Pyrotechnic Verification Test PVTOS Physical Vapor Transport of Organic Solids PVWA Planned Value of Work Accomplished PVWS Planned Value of Work Scheduled PW Pulse Width PWA Pratt and Whitney Aircraft PWA Private Write Area PWA Product Work Authorization PWB Printed Wire Board PWBS Program Work Breakdown Structure PWM Pulse-Width Modulation PWMD Printed Wiring Master Drawing PWR Power PWS Pricing Work Statement PY Program Year PYRO Pyrotechnics Q Q Dynamic Pressure Q Pitch Rate (Angular Rate) Q Alpha Pitch Dynamic Pressure Q Beta Yaw Dynamic Pressure Q-BAND 36,000 to 46,000 MCS QA Quality Assurance QAC Quality Assurance Chart QACAD Quality Assurance Corrective Action Document QAM Quality Assurance Manual QAP Quality Assurance Procedure QAR Quality Assurance Responsible/Witness QATT Qualification for Acceptance Thermal Testing QAVT Qualification for Acceptance Vibration Testing QAVT Qualification Acceptance Vibration Test QC Quality Control QCB Queue Control Block QCDR Quality Control Deficiency Report QCOP Quality Control Operating Procedure QD Quick Disconnect QDR Qualification Design Review QDS Quality Data System QE Quality Engineer QEC Quick Engine Change QF Quality Factor QGS Quantity Gaging System QINMS Quadruple Ion Neutral Mass Spectrometer QL Quick Look QLDR Quick Look Data Reference QLDS Quick Look Data Station QLS Quick Look Station QM Qualification Motor QPL Qualified Products List QPL Qualified Parts List QPR Quarterly Progress Report QPRD Quality Planning Requirements Document QPS Quality Planning Specification QPS Quantity Planning Specification QPSK Quadrature Phase Shift Key QRE Quick-Reaction Estimate QRI Quick-Reaction Integration QRIA Quick-Reaction Integration Activity QRS Quick-Reaction Sortie QRSL Quick-Reaction Space Laboratory QSA Qualification Site Approval QSGVT Quarter Scale Ground Vibration Test QSL Qualified Source List QSM Quarter Scale Model QSMVT Quarter Scale Model Vibration Testing QSS Quindar Scanning System QT Qualification Test QTP Qualification Test Plan QTR Qualification Test Report QTR Quarter QTRS Quarters QTY Quantity QUAD Quandrangle, Quadrant, Quadrature QUADS Quality Achievement Data System QUAL Quality QUAL Qualification, Qualified QUAT Quaternion QUI Quito, Ecuador (STDN) QUIC Quality Data Information and Control QUP Quality Unit Pack QVT Qualified Verification Testing QVVT Qualified Verification Vibration Testing R R Gas Constant R Radius R Range R Range Rate R Rankine R Ratio R Rear R Receive R Redundant R Regulate R Rehydratable R Reliability R Replace R Resistance R Right R Roentgen R Roll R Yaw Rankine Rate R BAR Radius Vector Axis R DOT Range Rate to Target (+) Opening, (-) Closing R IMP Minimum Range to Avoid Plum Impingement R&CC Recorder and Communication Control R&D Research and Development R&DO Research and Development Operations (MSFC) R&M Reliability and Maintainability R&OA Reliability and Quality Assurance R&P Reserve and Process R&PM Research and Program Management R&R Remove and Replace R&R Rendezvous and Recovery R&R Resupply and Return R&Z Range and Zero R-T Resistance Test R/A Radar Altimeter R/C Radio Command R/C Rate of Climb R/C Remote Control R/D Rate of Descent R/E Reentry R/I Receiving Inspection R/L Rate/Limited R/L Remote/Local R/O Rollout R/S Range Safety R/S Redundant Set R/T Real Time R/T Receiver/Transmitter R/W Read/Write R/W Runway RA Radar Altimeter (R/A preferred) RA Range Area RA Right Aft RA Right Ascension Ra Radium RAAB Remote Amplifier and Adaption Box RAAB Remote Application and Advisory Box RAB Risk Assessment Board RAC Reliability Action Center RACS Remote Automatic Calibration System RACS Rotation Axis Coordinate System RACU Remote Acquisition and Command Unit RAD Radar RAD Radian RAD Radiation Dosage RAD Radiator RAD Radius RAD Roentgen Absorbed Dosage RADAR Radio Detecting and Ranging RADCC Radiation Control Center RAE Radio Astronomy Explorer RAF Requirements Analysis Form RAG Reusable Agenda RAHF Research Animal Holding Facility RAI Radar Altimeter Indicator RAI Roll Attitude Indicator RAL Responsibility Assignment List RALPH Reduction and Acquisition of Lunar Pulse Heights RALT Radar Altimeter RAM Radar Absorption Material RAM Random Access Memory RAM Research and Applications Module RAM Responsibility Assignment Matrix RAMA Recap and Movement Authorization RANC Radar Absorption Noise and Clutter RANN Research Applied to National Needs RAPCON Radar Approach and Control RAPS Right AFT Propulsion System RAS Requirements Allocation Sheet RATCC Radar Air Traffic Control Center RAU Remote Acquisition Unit RAUIS Remote Acquisition Unit Interconnecting Station RAX Remote Access Computing System RAX Remote Access Terminal RB Radar Beacon RBA Radar Beacon Antenna RBC Red Blood Cells RBC Rotating Beam Ceilometer RBDE Radar Bright Display Equipment RBE Radiation Biological Effectiveness RBK Right Bank RBL Right Buttock Line RBMT Retrospective Bibliographies on Magnetic Tape RBN Radio Beacon RC Range Command RC Rate Command RC Recovery Controller RC Recurring Cost RC Resistance-Capacitance RC Reverse Current RC Rotation Control RCA Radio Corporation of America (SATCOM) RCA Remote Control Amplifier RCAG Remote Center Air-Ground RCAG Remote Control Air-Ground RCB Remote Circuit Breaker RCC Range Commanders Council (DOD) RCC Range Control Center RCC Reinforced Carbon-Carbon RCC Reusable Carbon-Carbon RCC Rough Combustion Cutoff RCCA Rough Combustion Cutoff Assembly RCCB Remote Control Circuit Breaker RCCP Recorder and Communications Control Panel RCD Record RCDP Record Parallel RCDR Recorder RCHCS Regenerable CO2 and Humidity Control System RCN Requirements Change Notice RCP Radiation Constraints Panel RCP Right Circular Polarization RCP Right Circular Polarizer RCPT Receipt RCPT Receptacle RCR Retrofit Configuration Record RCS Reaction Control System (Subsystem) RCSC Reaction Control Subsystem Controller RCU Remote Control Unit RCV Receive RCVR Receiver RCVS Remote Control Video Switch (Switcher) RCVY Recovery RCY Remaining Cycles RCY Recovery RD Radiation Detection RD Reference Designator RD Requirements Document RD Round RD/SB Rudder Speed Brake RDA Remote Data Access RDA Resident Data Area RDC Reference Designator Code RDC Request for Document Change RDCS Reconfiguration Data Collection System RDD Requirements Definition Document RDF Radio Direction Finder RDF Resource Data File RDM Real-Time Data Manager RDMTR Radiometer RDOC Reference Designation Overflow Code RDOUT Readout RDP Receiver and Data Processor RDP Requirements Data Plan RDP Requirements Development Plan RDR Raw Data Recorder RDR Rudder RDS Rocketdyne Digital Simulator RDT&E Research, Development, Test, and Evaluation RDTR Radiator RDW Response Data Word RDW Return Data Words RDX Cyclotrimethylenetrinitramine RDY Ready RE Responsible Engineer RE&T Research Engineering and Test REAC Reactant REACQ Reacquisition REC Receive REC Record (RCD preferred) RECERT Recertification RECHG Recharge RECIP Reciprocate RECOG Recognition RECON Remote Console RECONFIG Reconfiguration RECONN Reconnaisance RECOV Recovery RECP Receptacle RECP Request for Engineering Change Proposal RECRC Recirculate RECS Representative Shuttle Environmental Control System RECT Rectifier, Rectify RECV Receive RECVR Receiver RED Reduction REDUN Redundancy REED Rocket Exhaust Effluent Diffusion REEDA Rocket Exhaust Effluent Diffusion Analysis REF Reference REF Refurbish, Refurbishment REFRIG Refrigerate REFSMMAT Reference Stable Member Matrix REFURB Refurbish REG Register REG Regulator, Regulate REGEN Regenerate REI Range From Entry Interface (400 K) REI Runway End Identification REI-M REI-Mollite REIL Runway End Identification Lights REINF Reinforce REINIT Reinitialize REJ Reject REL Relative REL Release RELMAT Relative Matrix REM Release-Engage Mechanism REM Release Engine Mechanism REM Release Engine Module REM Release Escape Mechanism REM Remove REM Rocket Engine Module REM Roentgen Equivalent Man REN RAD Rendezvous Radar REND Rendezvous REPGROW Effects of Spatial Environment on the Reproduction and Growth of Bacteria REPL Replace REPR Repressurization REPRO Reproduction REQ Request REQ Require REQD Required REQMTS Requirements (RQMTS preferred) RES Reserve RES Reservoir RESID Residual RESIS Resistance RESP Responsibility RESVR Reservoir RET Retract RETEN Retention RETRO Retrofire RETRO Retrofire Officer RETRO Retro Controller (NASA) RETRV Retrieve RETS Reconfigurable Electrical Test Stand RETS Reconfiguration Electrical Test Stand REV Reverse REV Review REV Revision REV Revolution RF Communications Support RF Radio Frequency RF Right Forward RF-TK Radio Frequency Tracking RFA Request for Action RFA RF Authorization (Frequency) RFB Ready for Baseline RFB Request for Bid RFC Radio Frequency Charts RFC Request for Change RFC Request for Change Revolution RFCP Request for Computer Program RFD Requirements Formulation Document RFE Request for Estimate RFEI Request for Engineering Information RFI Remote Facility Inquiry RFI Request for Information RFI Remote File Inquiry RFI Radio Frequency Interference RFL Reflect RFM Reconfigurable Furnace Module RFO Request for Order RFP Request for Proposal RFP Requirements and Formulation Phase RFPA Request for Proposal Authorization RFQ Request for Quotation RFT Ready for Training RFW Request for Waiver (Deviation) RG Radio Guide RG Rate Gyro RGA Rate Gyro Assembly RGA Residual Gas Analyzer RGAL Rate Gyro Assembly-Left SRB RGAO Rate Gyro Assembly-Orbiter RGAR Rate Gyro Assembly-Right SRB RGM Redundant Gyro Monitor RGP Rate Gyro Package RGRMA Rate Gyro Redundancy Management Algorithm RH Relative Humidity RH Right Hand RHC Right Hand Circular RHC Rotation Hand Controller RHCM Relative Humidity Control/Monitor RHCP Right Hand Circular Polarization (Polarized) RHEB Right Hand Equipment Bay RHEO Rheostat RHFEB Right Hand Forward Equipment Bay RHL Residual Hazards List RHM Relative Humidity Monitor RHP Right Hand Panel RHS Right Hand Side RHS Rocketdyne Hybrid Simulator RHSC Right Hand Side Console RHT Radiant Heat Temperature RHU Radioisotope Heater Unit RHW Router Header Word RI Rockwell International RIB Recoverable Item Breakdown RIB Right Inboard RIC Resistance Inductance and Capacitance RIC Rockwell International Corporation RICC Remote Intercomputer Communications Interface RID Reaction Injection Molded RID Review Item Disposition RIDI Receiving Inspection Detail Instruction RIE Right Inboard Elevon RIF Relative Importance Factor RIG Rate Integration Gyro RIGI Receiving Inspection General Instruction RIL Recoverable Item(s) List(s) RIL Repairable Item List RIL Reparable Item List RIM Reaction Injection Molded RIMS Retarding Ion Mass Spectrometer RIPS Radar Impact Prediction System RIR Reportable Item Report RIS Reporting Identification Symbols RISA Rapid Imaging Spectrophotometric Array RISKAC Risk Acceptance RIT Request for Interface Tool RIU Remote Interface Unit RIV Recirculation Isolation Valve RJ/EC Reaction Jet/Engine Control RJC Reaction Jet Control RJD Reaction Jet Device RJD Reaction Jet Driver RJDA Reaction Jet Driver Aft RJDF Reaction Jet Driver Forward RJEC Reaction Jet Engine Control RJOD Reaction Jet OMS Driver RK Recharge RKD Rocketdyne RL Return Link RLA Repair Level Analysis RLA Repair Line Agreement RLC Remote Load Controller RLCD Redline Cutoff Device RLEO Request Liaison Engineering Order RLF Relief RLG Ring Laser Gyro RLO Rack Level Outgassing RLSS Regenerative Life Support System RLT Return Line Tether RLV Reusable Launch Vehicle RLY Relay RM Redundancy Management RM Reference Mission RM Remote Manipulator RM Rendezvous Maneuver RM Rescue Module RM Right Mid RM/MS&C Redundancy Management/Moding, Sequencing, and Control RMA Remote Manipulator Arm RMC Redundancy Management Control RMCD Radiation Monitoring Container Dosimeter RME Radiation Monitoring Equipment RMF RCS Module Forward RMG Right Main Gear RMI Radio Magnetic Indicator RMO Resident Manager's Office RMRS Repeatable Maintenance and Recall System RMS Radian Means per Second RMS Random Motion Simulator RMS Redundancy Management System RMS Remote Manipulator System (Subsystem) RMS Root-Mean-Square RMSVP Remote Manipulator Subsystem Verification Plan RMT Remote RN Reynolds Number RNDZ Rendezvous RNG Range RNG RT Range Rate RO Radar Operator RO Readout RO Receive Only RO Recovery Operations ROB Right Outboard ROC Record of Comments ROC Regional Operations Center ROC Request of Change ROD Remote Operated Door(s) RODB Remote Object Data Base ROLL Roll Angle ROM Read-Only Memory ROM Rough Order of Magnitude ROPE Research on Orbital Plasma Electrodynamics ROS Regulated Oxygen Supply ROS Regulated Oxygen System ROS Removable Overhead Structure ROS Rosman, North Carolina (STDN Site) ROSAT Roentgensatellite ROT Remaining Operating Time ROT Rota, Spain ROT Rotate, Rotation ROTI Recording Optical Tracking Instrument ROUT Rollout RP Relative Pressure RP Repair Period RP Rocket Propellant RPA Record and Playback Assembly RPA Request for Procurement Action (Authorization) RPC Remote Power Controller RPE Reliability Project Engineer RPIE Real Property Installed Equipment RPL Rated Power Level RPLC Replace RPM Rendezvous Pitch Maneuver RPM Revolutions per Minute RPO Radiation Protection Officer RPOC Remote Payload Operations Center RPP Reinforced Pyrolytic Plastic RPS Record and Playback System (Subsystem) RPS Revolutions per Second RPSF Rotation, Processing and Surge Facility RPT Resident Provisioning Team RPT Rudder Pedal Transducer RPTA Rudder Pedal Transducer Assembly RPV Remotely Piloted Vehicle RQ Respiratory Quotient RQMT Requirement RQMTS Requirements RR Range Rate RR Rendezvous Radar RR Requirements Review RR Respiration Rate RREA Rendezvous Radar Electronics Assembly RREU Rendezvous Radar Electronics Unit RRI Rendezvous Radar Indicator RRL Rudder Reference Line RRP Rudder Reference Plane RRR Risk Reduction Review RRT Rendezvous Radar Transducer RRT Rendezvous Radar Transponder RS Rawinsonde RS Redundancy Status RS Redundant Set RS Refurbishment Spare RS Remote Station RS Right Side RS&H Reynolds, Smith, & Hills, Inc. RS&S Receiving, Shipping, and Storage RSA Reference Satellite A RSB Rudder Speed Brake RSC Range Safety Control/Command RSCIE Remote Station Communication Interface Equipment RSD Requirements and Specifications Document RSDP Remote Site Data Processor RSF Receiving-Safing Facility RSF Refurbishment and Subassembly Facilities RSF Refurbishment and Subassembly Facility (KSC) RSI Reusable Surface Insulation RSL Resource Support List RSLS Redundant Set Launch Sequencer RSLV Resolve RSM Resume RSMM Redundant System Monitor Model RSO Radiological Safety Office RSO Range Safety Officer RSP Rendezvous Station Panel RSPL Recommended Spare Parts List RSS Range Safety Switch RSS Range Safety System RSS Reactants Supply System RSS Rib Structure Station RSS Robotic Servicer System RSS Root Sum Square RSS Rotating Service Structure RSSPO Resident Space Shuttle Project Office (Officer) RST Recessed Selectromatic Terminal RST Requirements Synthesis Team RSTRT Restart RSU Remote Service Unit RSVR Reservoir RSYS Responsible System RT Range-to-Target RT Rate RT Real Time (R/T preferred) RT Receiver-Transmitter RT Reference Trajectory RT Right RTA Real-Time Accumulator RTAC Research and Technology Advisory Committee RTADS Real-Time Attitude Determination System RTB Resistance Temperature Bulb RTC Real-Time Clock RTC Real-Time Command RTC Real-Time Computer RTC Room Temperature Cure RTCC Real-Time Command Controller RTCC Real-Time Computer Command (Uplink) RTCC Real-Time Computer Complex RTCC Real-Time Computer Center (NASA) RTCE Rotation/Translation Control Electronics RTCL Reticle RTCP Real-Time Communications Processor RTCS Real-Time Computer System RTD Rate Damping RTD Real-Time Display RTD Resistance Temperature Device RTE Responsible Test Engineer RTF Return to Flight RTG Radioisotope Thermal Generation RTG Radioisotope Thermoelectric Generator RTG Range (Slant) to Ground RTHC Rotation-Translation Hand Controller RTHS Real-Time Hybrid System RTIF Real-Time Interface RTLS Return to Launch Site RTN Return RTO Responsible Test Organization RTOP Research and Technology Objectives and Plans RTR Real-Time Ring RTR Rotor RTS Real-Time Supply RTS Remote Tracking Station RTSF Real-Time Simulation Facility RTTV Real-Time Television RTU Remote Terminal Unit RTV Room-Temperature Vulcanized RTV Room-temperature vulcanizing RU Remote Unit RUD Rudder RUPT Interrupt RUPT Rupture RUT Resource Utilization Time RV Recirculation Valve RV Recovery Vehicle RV Recovery Vessel RV Reentry Vehicle RV Relief Valve RV Retrieval Vessel RVCF Remote Vehicle Checkout Facility RVDT Rotary Variable Differential Transducer RVDT Rotary Variable Differential Transformer RVN Requirements Verification Network RVR Runway Visible (or Visual) Range RVS Reverse RW Response Word RWA Reaction Wheel Assembly RWD Right Wing Down RWM Read/Write Memory RYD Real Year Dollars RZ Return-to-Zero S (S) Safe (Task Classification) S Second S Side S Star S Stere s Second (Astronomical Tables) S CHG Supercharge S PRES Star Present S TRK Star Tracker S&A Safe and Arm (Device) S&A Science and Application S&AD Science and Applications Directorate S&E Science and Engineering (MSFC Directorate) S&H Safety and Health S&MA Safety and Mission Assurance S-BD S-Band S-Band 1,500 to 5,200 MHz S-MOWG "Super" Management Operations Working Group S-N Stress Number S/A Safe and Arm S/A Scheduled/Actual S/A Site Activation S/A Spacecraft Adapter S/A Subassembly S/AC Stabilization/Attitude Control S/B Standby S/C Sensor/Controller S/C Signal Conditioner S/C Software Contractor S/C Spacecraft S/C Splitter/Combiner S/C Stabilization and Control S/C Stripchart (Recorder) S/C Subcontractor S/EOS Standard Earth Observation Satellite S/F Safety Factor S/F Single Flow S/G Strain Gage S/L Shop/Laboratory S/M Scheduled Maintenance S/M Service/Maintenance S/M Structural/Mechanical S/M Systems management S/N Serial Number S/N Signal-to-Noise Ratio S/O Shutoff S/O Switchover S/P Serial to Parallel S/P Signal Processor S/R Send and Receive S/R Shift Register S/R Stimulus/Response S/S Samples per Second S/S Single Sideband S/S Space Shuttle S/S Subsystem S/SI Simulation and System Infrastructure S/Sys Subsystem S/U Set Up S/V Space Vehicle S/V Supply Valve S/W Software S1 Starboard 1 SA Safing Area SA Shaft Angle SA Single Access SA Site Activation SA Subaccount SA Supplemental Agreement SA Support Area SA Supportability Analysis SAA South Atlantic Anomaly SAA System Assurance Analysis SAAC Schedule Allocation and Control SAALC San Antonio Air Logistics Center SAAM Special Air Force Airlift Mission SAAMA San Antonio Air Material Area SAAS Shuttle Aerosurface Actuator Simulation SAB Shuttle Avionics Breadboard SAB Spacecraft Assembly Building SAB Storage and Assembly Building SAC Shuttle Action Center (HOSC) SAC Strategic Air Command (USAF) SAC Support Action Center SACS Software Avionics Command Support SACS Systems Software Avionics Command Support SAD Shuttle Authorized Document SAD Spacecraft Attitude Display SAD Systems Allocation Document SADA Solar Array Drive Assembly SADE Solar Array Drive Electronics SADE Structural Assembly Demonstration Experiment SADEC Spin Axis Declination SADM Solar Array Drive Mechanism SAE Society of Automotive Engineers SAE Solar Array Experiment SAEF Spacecraft Assembly and Encapsulation Facility SAES Stand-Alone Engine Simulator SAFD Systems Anomaly and Failure Detection SAFE San Andreas Fault Experiment SAFE Solar Array Flight Experiment SAGE-II Stratospheric Aerosol Gas Experiment SAIL Shuttle Avionics Integration Laboratory SAL Scientific Airlock SAL Shuttle Avionics Laboratory SALC Sacramento Air Logistics Center SAM Shuttle Attachment Manipulator SAM System Activation and Monitoring SAMP Shuttle Automated Mass Properties SAMS Shuttle Attachment Manipulator System SAMSO Space and Missile Systems Organization (USAF) SAMSOR SAMSO Regulation (now SDR) SAMTEC Space and Missile Test Center (VAFB, CA) SAMTEC Space and Missile Test Center Manual SAMTO Space and Missile Test Organization (VAFB) SANC Spacelab Ancillary Data Tape SAND Site Activation Need Date SAO Smithsonian Astrophysical Observatory SAP Strain Arrestor Plate SAR Safety Analysis Report SAR Search and Rescue SARP Safety Analysis Report for Packaging SARP Shuttle Astronaut Recruitment Program SARR Small and Rapid Response SART Stimuli Analog Refresh Table SAS Small Astronomy Satellite SAS Solar Array System SAS Space Adaptation Syndrome SAS Stability Augmentation Subsystem SAS Stability Augmented System SASA S-Band Antenna Structural Assembly SASE Shuttle Atmospheric Science Experiment SASP Science and Applications Space Platform SASTP Stand-Alone Self-Test Program SAT Saturate, Saturated SAT Systems Approach to Training SATAF Shuttle Activation Task Force SATO Shuttle Attached Teleoperator SATO Supply and Transportation Operations SATS Shuttle Avionics Test System SATS Small Aircraft Transportation System SATS Small Applications Technology Satellite SAU Signal Acquisition Unit SAU Strap Around Unit SAVER Shuttle Avionics Verification and Evaluation SAWD Solid Amine Water Desorbed SB Space Base SB Speed Brake SB Synchronization Base SB Synchronization Bit SBA Seat Back Assembly SBA Small Business Administration SBA Structure Borne Acoustic SBAS S-Band Antenna Switch SBC Speed Brake Command SBCR Stock Balance and Consumption Report SBD Schematic Block Diagram SBE Sub-Bit Encoder SBHC Speed Brake Hand Controller SBP San Luis Obispo (TACAN Station) SBP Sonic Boom Panel SBS Satellite Business System SBTC Speed Brake/Thrust Controller SBU Sensitive But Unclassified SBX S-Band Transponder SC Scale SC Service Charge SC Signal Conditioner (S/C preferred) SC Statement of Capability SC Statement of Compatibility SC Support Contractor SC Surface Command SCA Schedule Change Authorization SCA Sequence Control Assembly SCA Shuttle Carrier Aircraft SCA Simulation Control Area SCA Sneak Circuit Analysis SCADA Supervisory Control and Data Acquisition SCAMA Station Conferencing and Monitoring Arrangement SCAN Antenna Scan SCAN Selected Current Aerospace Notices SCAN Shuttle Connector Analysis Network SCAPE Self-Contained Atmospheric Protective Ensemble SCARAB Submersible Cable Assistant Repair and Burial SCARS Serialized Control and Record System SCARS Serialized Control and Reporting System SCARS Sneak Circuit Analysis Report Summary SCAS Subsystem Computer Application Software SCAT Space Communication and Tracking SCAT Storage, Checkout, and Transport SCATHA Spacecraft Charging at High Altitudes SCATS Simulation Control and Training System SCB Schedule Change Board SCB Selection Control Board SCB Selector Control Box SCB Software Control Board SCB Specification Control Board SCBD Seller's Approved Configuration Baseline Document SCC Safety Control Center SCC Simulation Control Center SCC Slidell Computer Complex SCC Standard Cubic Centimeters SCCB Site Configuration Control Board SCCF Solar Cell Calibration Facility SCCH Standard Cubic Centimeters per Hour SCCM Standard Cubic Centimeters per Minute SCCS Signal Conditioning and Control System SCCS Standard Cubic Centimeters per Second SCD Source Control Document SCD Source Control Drawing SCD Specification Control Document SCD Specification Control Drawing SCDA Safing, Cooldown, and Decontamination Area SCDP Simulation Control Data Package SCDR Seller Critical Design Review SCDR Shuttle Critical Design Review SCDR Software Critical Design Review SCDR Subcontractor Critical Design Review SCDU Signal Conditioning and Display Unit SCE Signal Conditioning Equipment SCEA Signal Conditioning Electronics Assembly SCF Safing and Deservicing Facility SCF Satellite Control Facility SCF Sequenced Compatibility Firing SCF Spacecraft Control Facility SCF Standard Charge Factor SCF Standard Cubic Feet SCF Statistical Collection File SCF Sunnyvale Control Facility SCFH Standard Cubic Feet per Hour SCFM Standard Cubic Feet per Minute SCFS Standard Cubic Feed per Second SCGSS Super Critical Gas Storage System SCHE Stowage Cargo Handling Equipment SCHED Scheduled, Scheduling SCHEM Schematics SCI Switch Closure In SCIM Standard Cubic Inches per Minute SCIS Standard Cubic Inches per Second SCIT Standard Change Integration and Tracking SCIU Selector Control Interface Test SCIU Space Interface Unit SCL Secondary Coolant Line SCL Secondary Coolant Loop SCL Specification Change Log SCLM Stability, Control, and Load Maneuvers SCM Site Configuration Message SCM Subsystem Configuration Management SCM Subsystem Configuration Monitoring SCM System Control Module SCMB Development Configuration Management Board SCMP System Contractor Management Plan SCN Specification Change Notice SCNP Preliminary Specification Change Notice SCNR Scanner SCO Start Checkout SCO Subcarrier Oscillator SCO Super Critical Oxygen SCO Switch Closure Out SCOE Special Checkout Equipment SCOPE Science Calibration and Onboard Performance Evaluator SCOS Subsystem Computer Operating System SCP Scanner Control Power SCP Specific Candle Power SCR Schedule Change Request SCR Sneak Circuit Report SCR Software Change Request SCR Stripchart Recorders SCRG System Change Review Group (MSFC) SCRL Station Configuration Requirement List SCRS Serialized Control and Reporting System SCRS Strip Chart Recording System (Subsystem) SCRSY Serialized Control and Record System SCS Secondary Coolant System SCS Spacecraft Control System SCS Stabilization and Control System (Subsystem) SCS System Configuration Switch SCSI Small Computer System Interface SCT Scanning Telescope SCU Secondary Control Unit SCU Sequence Control Unit SCU Service and Cooling Umbilical SCU Signal Conditioning Unit SCU Signal Control Unit SCU System Control Unit SD Scaling and Display SD Smoke Detector SD Solar Dynamic SD Space Division (AFSC) SD Space Division (Rockwell) SD Spare Disposition SD Specification Document SD Subscale Demonstrator SD Supplier Documentation SD/FS Smoke Detector/Fire Suppression SD/YVV SD/Launch Base Division SDA Shaft Drive Axis SDA Source Data Automation SDAF Solid Rocket Booster Disassembly Facility SDB Shallow Draft Barge SDB Shallow Draft Board SDC Shuttle Data Center SDC Software Development Computer SDC Spares Disposition Code SDCL Supplier Documentation Checklist SDCP Summary Development Cost Plan SDCS SAIL Data Communications System SDCV Shuttle Derived Cargo Vehicle SDD Shuttle Design Directive SDD Software Description Document SDD Software Design Document SDD System Design Document SDE Space Division Evaluator SDF Safing and Deservicing Facility SDF Single Degree of Freedom SDF Software Development Facility SDF System Development Facility (Breadboard) SDG Supplier Documentation Group SDH Software Development Handbook SDH System Definition Handbook SDH System Development Handbook SDI Selective Dissemination of Information SDIF Software Development and Integration Facility SDL Software Development Laboratory SDL Standard Distribution List SDM Secondary Deployment Mechanism SDM Shuttle Data Management SDM Subsystem Design Manuals SDM System Definition Manual SDMU Serial Data Management Unit SDN Software Development Note SDP Shuttle Data Processor SDP Site Data Processor SDP Software Development Plan SDP Supplier Data Package SDPC Shuttle Data Processing Complex SDPF Sensor Data Processing Facility SDR Software Design Requirements SDR Software Design Review SDR Space Division Regulation SDR Spacelab Disposition Record (ESA) SDR Subcontract Data Requirement SDR System Design Review SDRB Software Design Review Board SDRB Supplier Documentation Review Board SDRB System Design Review Board SDRD Supplier Data Requirements Description SDRD Supplier Documentation Review Data SDRL Subcontract Data Requirements List SDRL Supplier Data Requirements List SDS Shuttle Dynamic Simulation (Simulator) SDS Sensor Display System SDS Software Design Specification SDS Steering Damping System SDSS Space Division Shuttle Simulator SDT Scaling and Display Task SDT Shuttle Data Tape SDT Structural Dynamic Test SDTA Structural Dynamic Test Article SDV Shuttle Derived Vehicle SDVF Software Development and Verification Facilities SE Science and Engineering (workstation) SE Student Experiment SE Support Equipment SE System Element SE Systems Engineering SE&I Systems Engineering and Integration SE/FAC Support Equipment/Facility SEA Scanning Electrostatic Analysis SEA Sensor Electronics Assembly SEA Silicon Elastimeter Ablator SEACF Support Equipment Assembly and Checkout Facility SEADS Shuttle Entry Air Data Sensor SEADS Shuttle Entry Air Data System (Subsystem) SEAID Support Equipment Abbreviated Items Description SEAPG Support Equipment Acquisition Planning Group SEARCHS Shuttle Engineering Approach/Rollout Control Hybrid Simulation SEB Scientific Equipment Bay SEB Source Evaluation Board SEB Support Equipment Building SEB Systems Engineering Branch SEC Secondary SEC Sequential Events Controller SEC Source Evaluation Committee sec Second (s preferred) SECIB Shuttle Engineering Change Implementation Board SECO Sustainer Engine Cutoff SECS Shuttle Events Control Subsystem SECT Spacelab Experiment Channel Tape SEDS Small Expendable Deployer System SEDT Spacelab Experiment Data Tape SEE Special Purpose End Effector SEE Standard End Effector SEEDS Space-Exposed Experiment Developed for Students SEG Segment SEG System Engineering Groundrule SEI Support Equipment Installation SEI System Engineering Instrumentation SEICO Support Equipment Installation and Checkout SEII Servoactuator Error Indication Interrupt SEL Select, Selector SEM Sample Exchange Mechanism SEM Scanning Electron Microscope SEM Seller's Engineering Memorandum SEM Space Environment Monitoring SEM Spacecraft Equipment Module SEM System Engineering Management SEMA Support Equipment Move Authorization SEMS Space Environment Monitor System SEN Sensor SEND Shared Equipment Need Date SENS Sensitivity SEO Special Engineering Order SEO Subtransfer Earth Orbit SEOS Synchronous Earth Observation Satellite SEP Separation SEP Source Evaluation Panel SEP Support Equipment Package SEP Support Electronics Package SEPAC Space Experiment with Particle Accelerators SEPAP Shuttle Electrical Power Analysis Program SEPAR Shuttle Electrical Power Analysis Report SEPS Solar Electric Propulsion System SEQ Sequence, Sequencer SER Serial SERB Shuttle Engineering Review Board SERB Systems Engineering Review Board SERS Shuttle Equipment Record System SERV Service SERV Single Stage Earth Orbital Reusable Vehicle SERVICE Space Entry Recovery Vehicle in Commercial Environments SERVO Servomechanism SES Senior Executive Service SES Shuttle Engineering Simulation SES Special Emphasis Study SES Systems Engineering Simulation SESA Special Equipment Stowage Facility SESAC Space and Earth Sciences Advisory Committee SESAME Severe Environmental Storms and Mesoscale Experiment SESC Shuttle Events Sequential Control SESL Space Environmental Simulation Laboratory SETI Search for Extraterrestrial Intelligence SETS Shuttle Electrodynamic Tether System SEUL Support Equipment Utilization List SEWP Scientific & Engineering Workstation Procurement SF Safe SF Safe, R and QA (R&QA), and Protective Services (KSC Directorate) SF Safety Factor SF Scale Factor SF Selection Filter SF Signaling Frequency SF Sliding Filter SF Star Field SF Static Firing SF Subcontractor Furnished SF-SOO KSC Safety Operations Office SFA Space Flight Awareness SFA Sun Finder Assembly SFACI Software Flight Article Configuration Inspection SFC Selection Filter Control SFC Specific Fuel Consumption SFCS Survival Flight Control System SFD Crossfeed SFDS System Functional Design Specification SFDT Site Format Dump Tape SFEX Solar Flare X-ray Polarimeter SFL Secondary Freon Loop SFME Storable Fluid Management Experiment SFO Space Flight Operations SFOC Space Flight Operations Contract SFOM Shuttle Flight Operations Manual SFOP Safety Operating Procedure (KSC) SFP Single Failure Point SFP Summary Flight Plan SFPA Single Failure Point Analysis SFPPL Short Form Provisioning Parts List SFPS Single Failure Point Summary SFS Shuttle Flight Status SFSS Satellite Field Service Station SFSS SPARTAN Flight Support Structure SFT Shaft SFT Simulated Flight Test SFT Static Firing Test SFTA Structural Fatigue Test Article SFTF Static Firing Test Facility SFTWE Software SFU Standard Firing Unit SFW Software SFWE(M) Static Feed Water Electrolysis (Module) SG Signal Generator SGC Stabilized Ground Cloud SGG Superconducting Gravity Gradiometer SGGM Superconducting Gravity Gradiometer Mission SGL Space Ground Link SGLS Space Ground Link Station SGLS Space Ground Link System SGMT Simulated Greenwich Mean Time SGOS Shuttle Ground Operations Simulation (Simulator) SGP Single Ground Point SGS Space Gateway Support SGS Steep Glide Slope SGSC Strain Gauge Signal Conditioner SH2 Supercritical Hydrogen SHA Sidereal Hour Angle SHA System Hazard Analysis SHAG Simplified High Accuracy Guidance (Honeywell) SHAP Sample Handling and Analysis Plan SHARE Space Station Heat Pipe Advanced Radiation (STS-29) SHARE Space Station Heat Pipe Advanced Radiation Element SHARP Summer High School Apprenticeship Research Program SHDN Shutdown SHE Supercritical Helium SHEAL Shuttle High Energy Astrophysics Laboratory SHERB Sandia Human Error Rate Bank SHF Super High Frequency SHLB Simulation Hardware Load Boxes SHLC Safety, Health and Leadership Council SHLD Shield SHLDR Shoulder SHOOT Superfluid Helium On-Orbit Transfer SHORAN Short Range Navigation SHP Shaft Horsepower SHRD Shroud SHRD Supplemental Heat Rejection Devices SHS Simulation Hardware System SHTR Shutter SHUTDN Shutdown SI Center Support Operations (KSC Directorate) SI International Systems of Units (ISU preferred) SI Scientific Instrument SI Solar Inertial SIA Shuttle Induced Atmosphere SIA Software Impact Assessment SIA Solar Inertial Attitude SIAC Safety Issue Assessment Center SIAP System Integrity Assurance Program SID Shuttle Integration Device SID Simulator Interface Devices SID Standard Interface Document SID System Interface Document SIDT Spacelab I/O Data Tape SIE Shuttle Interface Equipment SIEM Systems Integration Effort for MSFC SIES Supervision, Inspection, Engineering, and Services SIG Signal SIG Special Investigation Groups SIG CONDR Signal Conditioner SIG GEN Signal Generator SIL Silver SIL Sound Interference Level SIL Systems Integration Laboratory SILTS Shuttle Infrared Leeside Temperature Sensing SIM Scientific Instrumentation Module SIM Simulate, Simulation SIMA Small Incremental Motion Actuator SIMAS Shuttle Information Management Accountability System SIMCOM Simulation Complex SIMFAC Simulation Facility SIMO Simultaneously SIMR Systems Integration Management Review SIMS Shuttle Imaging Microwave System SIMS Shuttle Inventory Management System SIMS Still Image Management System SIMU Simulated Inertial Measurement Unit SIN Sine SINDA Systems Improve Numerical Differencing Analyzer SIO Serial Input/Output SIO Systems Integration Office SIP Scientific Instrument Package SIP Separation Instrument Package SIP Standard Interface Panel SIP Strain Isolator Pad SIPE Scientific Instrument Protective Enclosure SIPS Small Instrument Pointing System SIR Shuttle Imaging Radar SIR Software Initiated Restart SIR System Interface Requirements SIR Systems Integration Review SIR-A Shuttle Imaging Radar-A SIR-B Shuttle Imaging Radar-B SIRD Support Instrumentation Requirements Document SIRR Software Integration Readiness Review SIRTF Space Infrared Telescope Facility SIS SAIL Interface System SIS Scanning Imaging Spectrometer SIS Serial Input Special SIS Shuttle Information System SIS Shuttle Interface Simulator SIS Simulator Interface System (Subsystem) SIS Software Implementation Specification SIS Software Integrated Schedule SIS Standard Interface Specification SIS Superconducting-Insulating Superconducting SIS Systems Integration Schedule SISS Scientific Instrument Support Structure SISWG STS Integrated Schedule Working Group SIT Shuttle Integrated Test SIT Shuttle Interface Test SIT Situation SIT Software Integrated Test SIT SSV Integrated Test SIU Signal Interface Unit SIV Sieve SIVE Shuttle Interface Verification Equipment SKD Singer, Kearfott Division SKIRT Shuttle Kientic Infrared Test SL Sea Level SL Seal SL Service Level SL Shelf Life SL Sound Level SL Spacelab SL&I System Load and Initialization SL-D German Spacelab SL-J Japanese Spacelab SL-SS Spacelab Subsystems SL-SSS Spacelab Subsystem(s) Segment SLA ERNO Spacelab Product Assurance Department SLA Shuttle Laser Altimeter SLA Super Light Ablator SLA Support and Logistics Areas SLAC Stanford Linear Accelerator Center SLAHTS Stowage List and Hardware Tracking System SLAK Spacelab Late Access Kit SLAM Side Load Arrest Mechanism SLAR Side Looking Airborne Radar SLC Shuttle Launch Complex (VAFB) SLC Space Launch Complex SLC ERNO Spacelab Project Control SLCA ERNO Spacelab Contract Administration SLCC ERNO Spacelab Configuration Management SLCL Shop/Lab Configuration Layout SLD Stiff-Leg Derrick SLE ERNO Spacelab Engineering SLEMU Spacelab Engineering Model Unit SLF Shuttle Landing Facility (OLF) SLF Shuttle landing facility (KSC) SLI ERNO Spacelab Integration and Test SLIC Super Lightweight Interchangeable Carrier SLL Shelf Life Limit SLM Sound Level Meter SLN ERNO Spacelab Payload SLO ERNO Spacelab Operations SLOS Star Line of Sight SLP ERNO Spacelab Program Office SLPB Spacelab Program Board SLRV Shuttle Launched Research Vehicle SLS Secondary Landing Site SLS Secondary Mirror SLS Sortie Lab Simulator SLS Spacelab Simulator SLS Spacelab Life Sciences SLS Statement Level Simulator SLSA Shuttle Logistics Support Aircraft SLSMS Spacelab Support Module Simulator SLT ERNO Spacelab Technology SLV Space Launch Vehicle SM Science Mission SM Secondary Mirror SM Service Model SM Short Module SM Shuttle Management (KSC) SM Soft Manual SM Stable Member SM Support Module SM Systems Management SM&S Systems Management and Sequencing SM/PM System Management/Performance Monitor SMA Science Monitoring Area SMA Secondary Mirror Assembly SMAB Solid Motor Assembly Building SMAG Star Magnitude SMART Shuttle Meeting Action - Item Review Tracking SMATV Satellite Master Antenna Television SMB Space Meteorology Branch SMC Scientific Manpower Commission SMCC Shuttle Mission Control Center SMCH Standard Mixed Cargo Harness SMCS Separation Monitor and Control System SMCU Separation Monitoring Control Unit SMD Spacelab Mission Development SMD Special Measuring Device SMD Special Measuring Service SMDC Shielded Mild Detonating Cord SME Subject Matter Expert SMEAR Span/Mission Evaluation Action Request SMES Shuttle Mission Engineering Simulator SMES Shuttle Mission Evaluation Simulation (Simulator) SMES Superconduction Magnetic Energy Storage SMG Spaceflight Meteorology Group SMIA Serial Multiplexer Interface Adapter SMIDEX Spacelab Middeck Experiments SMIR Shuttle Multispectral Infrared Radiometer SML Structure Mold Line SMM Solar Maximum Mission SMM Subsystem Measurement Management SMMD Specimen Mass Measurement Device SMOC Simulation Mission Operation Computer SMP Software Management Plan SMP Symmetric Multi-Processing SMPM Structural Materials Property Manual SMPTRB Shuttle Main Propulsion Test Requirement Board SMQ Structure Module Qualification Test SMR Source, Maintenance, and Recoverability (Code) SMRD Spin Motor Rotational Detector SMRD Spin Motor Run Discrete SMRM Solar Maximum Repair Mission SMS Separation Mechanism Subsystem SMS Shuttle Mission Simulator SMS Solar Maximum Satellite SMS Space Motion Sickness SMS Synchronous Meteorological Satellite SMS Systems Management Server SMSCC Shuttle Mission Simulator Computer Complex System SMSI Standard Manned Space Flight Initiator (see NSI-I) SMT Selective Message Transaction SMT Surface Mount Technology SMTAS Shuttle Model Test and Analysis System SMTF Shuttle Mission Training Facility SMTP Simple Mail Transfer Protocol SMU Soft Mockup SMU Speaker/Microphone Unit SMVP Shuttle Master Verification Plan SMVRD Shuttle Master Verification Requirements Document SMW Standard Materials Worksheet SMY Solar Maximum Year SN Solar Network SN Space Network SNF System Noise Figure SNR Signal-to-Noise Ratio SNS Station Network Simulator SNSO Space Nuclear Systems Office SNSR Sensor SO Station Operator SO Support Operations (KSC Dir.) SO2 Sulphur Dioxide SOAR Shuttle Orbital Applications and Requirements SOARS Shuttle Operation Automated Reporting System SOATS Support Operation Automated Training System SOC Simulation Operations Center SOC Simulation Operation Computer SOC System Operating Concept SOC System Option Controller SOCAR Shuttle Operational Capability Assessment Report SOCC Satellite Operations Control Center SOCH Spacelab Orbiter Common Hardware SOCRD Science Operations Center Requirements Document SOCS Subsystem Operation and Checkout System SODB Shuttle Operational Data Book SODB Start of Data Block SODS Shuttle Operational Data System SODS Skylab Orbit-Deorbit System SOE Science Operations Element SOE Sequence of Events SOF Safety of Flight SOFI Spray-on Foam Insulation SOFIA Stratospheric Observatory for Infrared Astronomy SOFT Space Operations and Flight Techniques SOGS Science Operations Ground System SOH Start of Heading SOHO Solar and Heliospheric Observatory SOIS Spacelab/Orbiter Interface Simulator SOL Solar SOL Solenoid SOLCON Solar Constant SOLN Solution SOLSPEC Solar Spectrum SOM Ship Operations Manager (NASA) SOM Spares Optimization Model SOM Standard Operating Manual SOMD Space Operations Mission Directorate SOMF Start of Minor Frame SOMS Shuttle Orbiter Medical System SONET Synchronous Optical Network SOP Secondary Oxygen Pack SOP Spacelab Opportunity Payload SOP Standard Operating Procedure SOP Subsystem(s) Operating Procedure SOP Subsystem Operating Program SOP Systems Operation Plan SOPC Shuttle Operations and Planning Center SOPC Shuttle Operations Planning Complex SOR Specification Operational Requirement SOR Stable Orbit Rendezvous SORD Systems Operations and Requirements Document SORPTR South Repeater SORTIE Short Term Mission SOS Serial Output Special SOS Source of Supply SOS Stabilized Optical Sight SOSC Space Operations Support Center SOSM Strap-on Solid Motor SOT Science Operations Team SOT Solar Optical Telescope SOT Strap-on Tank SOTS Suborbital Tank Separation SOUP Solar Optical Universal Photopolarimeter SOV Shut-off Valve SOV Solenoid Operated Valve SOW Start of Word SOW Statement of Work SOW Subdivision of Work SOX Supercritical Oxygen SP Shoulder Pitch SP Shuttle Projects Office (KSC) SP Signal Processor SP Single Pole SP Single Precision SP Solar Physics SP Spare SP Spin SP Standard or Peculiar SP Static Pressure SP&S Special Processes and Sequencing SP-AF Air Force STS Liaison Office (KSC Shuttle) SP-AF Air Force Support Office (KSC) SP-FGS Flight and Ground Systems Office (KSC Shuttle) SP-ILS Integrated Logistics Support Office (KSC Shuttle) SP-LMO Logistics Management Office (KSC) SP-OPI Operations Planning and Integration Office (KSC Shuttle) SP-OSO Off-Site Offices (KSC Shuttle) SP-PAI Project Assessment and Integration Staff (KSC) SP-PCO Program Control Office (KSC Shuttle) SP-PMS Performance Management Systems Office (KSC) SP-SMO Site Management Office (KSC Shuttle) SPA S-Band Power Amplifier SPA Servo Power Amplifier SPA Shared Peripheral Area SPA Signal Processor Assembly SPA Small Payload Accommodations SPA Software Product Assurance SPA Solar Panel Assembly SPA Space Processing Application SPA Spare Parts Analysis SPA Steering Position Amplifier SPACE Spacecraft Prelaunch Automatic Checkout Equipment SPAD Subsystem Positioning Aid Device SPAD Shuttle Payload Accommodation Document SPADS Shuttle Problem Analysis Data System SPADS Shuttle Problem Action Data System SPAF Simulation Processor and Formatter SPAH Spacelab Payload Accommodations Handbook SPAN Spacecraft Analysis SPART Space Research and Technology SPAS Shuttle Pallet Satellite (German) SPBK Speed Brake SPC Starting Point Code SPC Shipping and Packing Cost SPC Stored Program Command SPC Synoptic Properties Code SPC Shuttle processing contractor SPCC STS Processing Control Center SPCU Simulation Process Control Unit SPCW Stored Program Command Word SPD Standard Practice Directive SPD Speed SPDR Software Preliminary Design Review SPDB Subsystem Power Distribution Box SPDBK Speed Brake SPDCI Standard Payload Display and Control Interface SPE Solid Polymer Electrolysis SPE Static Phase Error SPEARS Shuttle Processing Electronic Archival & Retrieval System SPEC Specialist Function SPEC Specification SPEC Standard Performance Evaluation Corporation SPECT Spectrometer SPEE Special Purpose End Effector SPF Single Point Failure SPF Software Production Facility SPF Spacelab Processing Facility SPFA Single Point Failure Analysis SPFP Single Point Failure Potential SPG Signal Point Ground SPG Single Point Ground SPHER Spherical SPI Standard Practice Instruction SPI Surface Position Indicator SPIAP Shuttle/Payload Integration Activities Plan SPICE Spacelab Payload Integration and Coordination in Europe SPIDF Support Planning Identification File SPIDPO Shuttle Payload Integration and Development Program Office (JSC) SPIF Standard Payload Interface Facility SPIF Shuttle Payload Integration Facility SPIF Shuttle/POCC Interface Facility Function SPII Shuttle Program Implementation Instruction SPIMS Shuttle Program Information Management System SPIP Solid Propulsion Integrity Program SPKR Speaker SPL Scratch Pad Line SPL Serialized Parts List SPL Sound Pressure Level SPL System Programming Language SPLX Simplex SPLY Supply SPM Subsystem Project Manager SPMS Special Purpose Manipulator System SPN Shuttle Project Notice (KSC) SPND Suspend SPO Spare Parts Order SPO Shuttle Projects Office SPO System Program Office SPOC Shuttle Payload Operations Contractor SPOC Single Point of Contact SPOM STS Planning and Operations Management SPP Science Power Platform SPP Simulation Planning Panel SPP Solar Physics Payload SPPIL Shuttle Preferred Pyrotechnic Items List SPPL Spare Parts Provisioning List SPPP Spacelab Payloads Processing Project SPR Software Problem Report SPR Subcontractor Performance Review SPRAG STS Payloads Requirements and Analysis Group SPRT Sequential Probability Ratio Test SPS Service Propulsion Subsystem SPS Shuttle Procedures Simulator SPS Statement of Prior Submission SPS Samples per Second SPS Secondary Propulsion System SPS Solar Power Satellite SPT Support SPT Steering Position Transducer SPTD Supplemental Provisioning Technical Documentation SPVPF Shuttle Payload Vertical Processing Facility sq ft Square Feet SQL Squelch SQL Structured Query Language SQUID Superconducting Quantum Interference Device SQW Square Wave SR Scan Ratio SR Shift Register SR Standard Repair SR Statement of Requirements SR Status Register SR Status Report SR Status Review SR Sunrise SR Support Request SR Support Room SR&Q Safety, Reliability, and Quality SR&QA Safety, Reliability, and Quality Assurance SRA Spin Reference Axis SRA Support Requirements Analysis SRAG Space Radiation Analysis Group SRB Solid Rocket Booster SRBAB SRB Assembly Building SRBDF SRB Disassembly Facility SRBPF Solid Rocket Booster Processing Facility SRC Sample Return Container SRCB Software Requirements Change Board SRCB Software Requirements Control Board SRCBD Software Requirements Change Board Directive SRCBD Software Requirements Control Board Directive SRCH Search SRD Shuttle Requirements Definition SRD Shuttle Requirements Document SRD Systems Requirements Document SRDH Subsystems Requirement Definition Handbook SRDH System Requirements Definition Handbook SRE STDN Ranging Equipment SRF Shuttle Refurbishment Facility SRH Subsystems Requirements Handbook SRM Specification Requirements Manual SRM Standard Reference Material SRM Solid Rocket Motor SRMC Stimulus/Response Measurements Catalog SRN Software Release Notice SRO Supervisor Range Operations SRPA Spherical Retarding Potential Analyzer SRR Shuttle Requirements Review SRR Site Readiness Review SRR Software Requirements Review SRR System Requirements Review SRS Simulated Remote Station SRS Software Requirements Specification SRS Specification Revision Sheet SRS Support Requirements System SRSF SRB Receiving and Subassembly Facility SRSF SRB Refurbishment and Subassembly Facility SRSR Schedule and Resources Status Report SRSS Shuttle Range Safety System SRT Supporting Research and Technology SRT Station Readiness Test SRT Specification Requirements Table SRT Special Rated Thrust SRT Shuttle Requirements Traceability SRU Shop-Replaceable Unit SRU Shop Replacement Unit SRU Space Replaceable Units SRVL Survival SS Shuttle System SS Single Sideband SS Single String SS Space Shuttle SS Space Station SS Station Set SS Subsystem SS Sunset SS System Software SS System Specification SS System Summary SS&A Space Systems and Applications SSA S-Band Single Access SSA Shuttle Simulation Aircraft SSA Space Suit Assembly SSA I/O GCOS Program Element Name SSAT Shuttle Service and Access Tower SSAT Space Shuttle Access Tower (now FSS) SSAT Space Station Airlock Trainer SSB Single Sideband SSB Source Selection Board SSBC Summary Sheet Bar Chart SSBUV Shuttle Solar Backscatter Ultraviolet Instrument SSC Scanning Shadow Camera SSC Shuttle System Contractor SSC Single-Stage Command SSC Solid-Solution Cermet SSC Stennis Space Center SSC Subsystem Computer SSC Subsystem Sequence Controller SSCA Surface Sampler Control Assembly SSCC Support Services Control Center SSCC Space Station Control Center SSCE Solid Surface Combustion Experiment SSCHS Space Shuttle Cargo Handling System SSCL Shuttle System Commonality List SSCP Small Self-Contained Payloads SSCSP Space Shuttle Crew Safety Panel SSD Spacecraft Software Division SSD System Summary Display SSDD Software System Design Document SSDH Subsystem Data Handbook SSDS Space Station Data System SSE Small Science Experiment SSE Space Shuttle Engines SSE Subsystem Element SSE Subsystem Support Equipment SSEOS Space Shuttle Engineering and Operations Support SSF SRB Storage Facility SSFA Space Station Furnace Facility SSFGSS Space Shuttle Flight and Ground System Specification SSFL Santa Susana Field Laboratory SSFMB Space Station Freedom Manned Base SSFP Space Station Freedom Program SSFS Space Shuttle Functional Simulator SSHB Station Set Handbook SSHPF Space Station Hazardous Processing Facility SSI Significant Structural Item SSIBD Shuttle System Interface Block Diagram SSID Shuttle Stowage Installation Drawing SSIP Systems Software Interface Processing SSIS Space Station Information System SSITP Shuttle System Integrated Test Plan SSL Secure Sockets Layer SSL System Software Loader SSM Sample Support Module SSM Spacecraft Systems Monitor SSM Subsystem Manager SSM Support System Module SSM Systems Support Module SSMB Space Shuttle Maintenance Baseline SSME Space Shuttle Main Engine SSMEC Space Shuttle Main Engine Controller SSMECA Space Shuttle Main Engine Controller Assembly SSMECA SSME Controller Assembly SSO Safety Signification Operation SSO Source Selection Official SSO Space Shuttle Orbiter SSO Subsystem Operation (in Spacelab) SSO Support System for OEX SSOP Space Systems Operating Procedure(s) SSP Small Sortie Payload SSP Space Shuttle Program SSP Standard Switch Panel SSPC Spacelab Stored Program Command SSPD Shuttle System Payload Data SSPD Shuttle System Payload Definition (Study) SSPD Shuttle System Payload Description SSPDA Space Shuttle Payload Data Activity SSPDB Subsystem Power Distribution Box SSPDS Space Shuttle Payload Data Study SSPGSE Space Shuttle Program Ground Support Equipment SSPM Space Shuttle Program Manager SSPO Space Shuttle Program Office SSPO Space Shuttle Projects Office SSPP System Safety Program Plan SSPPSG Space Shuttle Payload Planning Steering Group SSPRO Space Shuttle Program Resident Office SSPS Space Shuttle Program schedule SSPTF Santa Susana Propulsion Test Facility (see SSFL) SSPTS Station to Shuttle Power Transfer System SSR Shop Support Request SSR Staff Support Room SSR Station Set Requirement SSR System Requirements Review SSRD Station Set Requirements Documents SSRMS Space Station Remote Manipulator System SSRN System Software Reference Number SSRR Station Set Requirements Review SSS Sound Suppression System SSS Space Shuttle System SSS Stage Separation Subsystem SSS Station Set Specification SSS Subsystem Segment SSSS Space Shuttle System Specification SST Single System Trainer SST Spacecraft Systems Test SST Structural Static Test SST Subsystem Terminal on Spacelab SSTC Space Shuttle Test Conductor SSTF Space Station Training Facility SSTG Space Shuttle Task Group SSTO Single Stage To Orbit SSU Space Station Utilization Office SSUS Spinning Solid Upper Stage SSUS-A SSUS for Atlas-Centaur Class Spacecraft SSUS-D SSUS for Delta Class Spacecraft SSUSP Spinning Solid Upper Stage Project SSV Space Shuttle Vehicle ST Self Test ST Sequential Timer ST Simplification Task ST Space Telescope ST Spacelab Technology ST Special Tooling ST Star Tracker ST Starter ST Static ST Structural ST-ECF Space Telescope European Coordinating Facility STA Shuttle Training Aircraft STA Static Test Article STA Station STA Structural Test Article STAB Stabilize, Stabilizer STAC Shuttle Task Activation Contractor STADAC Station Data Acquisition and Control STADAN Satellite Tracking and Data Acquisition Network STADAN Space Tracking and Data Acquisition Network STADN Space Tracking and Acquisition Network STADU System Termination and Display Unit STAG Shuttle Turnaround Analysis Group STAR Scientific and Technical Report STAR Shuttle Turnaround Analysis Report STARR Schedule, Technical, and Resources Report STAS Space Transportation Architecture Studies STAT Statistics STAT Status STBD Starboard STBE Space Transportation Booster Engine STBY Standby STC Satellite Test Center STC Spacecraft Test Conductor STC Standard Test Configuration STC Systems Test Complex STCP Short-Term Cost Plan STD Shuttle Test Director STD Standard STDCE Surface Tension Driven Convection Experiment STDCF Space Telescope Data Capture Facility STDL Standard Distribution List (letter denoting which list follows) STDN Space Tracking and Data Network STDN Spaceflight Tracking and Data Network STDY Steady STE Special Test Equipment STE System Test Engineer STEP Space Technology Experiments Platform STEREO Solar Terrestrial Relations Observatories STEX Sensor Technology Experiment STF Spin Test Facility (see DSTF) STF Structural Fatigue Test STG Stage STICS Suprathermal Ion Composition Spectrometer STIL Software Test and Integration Laboratory STIRD SAIL Test Implementation Requirements Document STL Space Technology Laboratories STLOS Star Line of Sight STM Signal Termination Module STN Software Trouble Note STM Static Test Model STM Support Test Manager STME Space Transportation Main Engine STN Software Trouble Note STO Stow STOCC Space Telescope Operations Control Center STP Self-Test Program STP Shuttle Technology Panel STP Space Technology Payload STP Space Test Program STP Subsystem Test Plan STPH Static Phase Error STR Structure STR System Test Review STRL Structural STRB Strobe STRCH Stretch STRFLD Star Field STRG Steering STRG String STRUC Structure STRUCT Structure STS Shuttle Test Station STS Space Transportation System (formal name for the Space Shuttle) STS Structural Transition Section STSR System Test Summary Report STSG Shuttle Test Group STSOPO Shuttle Transportation Systems Operations Program Office (JSC) STT Spacelab Transfer Tunnel STU Shuttle Test Unit STU Special Test Unit STU Star Tracker Unit STV Space Transfer Vehicle SU Support Unit SUB Substitute SUBJ Subject SUM Summary SUMC Space Ultrareliable Modular Computer SUMM Summary SUMS Shuttle Upper-Atmosphere Mass Spectrometer SUP Supply SUP Support SUPCRIT Supercritical SUPPR Suppression SUPSALV Supervisor of Salvage (U.S. Navy) SUPT Support SUPV Supervisor SURE Shuttle Users Review and Evaluation SURF Surface SURS Standard Umbilical Retraction System SUSIM Solar Ultraviolet Spectral Irradiance Monitor SUTAGS Shuttle Uplink Text and Graphics Scanner SV Safety Valve SV Solemoid Valve SV Shuttle Vehicle SV Space Vehicle SV Stator Vector SVA&C Shuttle Vehicle Assembly and Checkout SVAB Shuttle Vehicle Assembly Building SVAC Shuttle Vehicle Assembly and Checkout (Facility) SVAFB South Vandenberg Air Force Base SVB Shuttle Vehicle Booster SVB Space Vehicle Booster SVC Supervisor Call SVDS Space Vehicle Dynamic Simulator SVM Sensor Verification Mechanism SVO Space Vehicle Operations (KSC Dir.) SVRR Software Verification Readiness Review SVS Space Vision System SVS Suit Ventilation System SW Sea Water SW Short Wave SW Software (SFTWE preferred) SW Solar Wing SW Status Word SW Switcher (Switch) SW/PM System Management/Performance Monitor SWA Support Work Authorization SWAA Spacelab Window Adapter Assembly SWAD Subdivision of Work Authorization Document SWAT Stress Wave Analysis Technique SWG Software Working Group SWICS Solar-Wind Ion-Composition Spectrometer SWOB Salaries, Wages, Overhead, and Benefits SWP Safe Working Pressure SWR Standing Wave Ratio SWS Switch Scan SWT Supersonic Wind Tunnel SXT Sextant SY Shoulder Yaw SY System SYM Symbol SYMM Symmetrical SYN Synchronous SYN Synthetic SYNC Synchronize SYNCOM Hughes Spin Stabilized Spacecraft SYNCOM Synchronous Communication Satellite (Hughes) SYS System SYSTRAN Systems Analysis Translator T T Talk/Monitor T Temperature T Temperature Rate T Test T Thermostabilized T Throttle Command T Time (liftoff) T Top T Total Temperature T Transformation (Matrix), Transpose (Matrix Superscript) T= Time Equivalent (used for duration of event) T&C Telemetry and Command T&CD Timing and Countdown T&CP Test and Checkout Procedure T&D Transportation and Docking T&E Test and Evaluation T&M Time and Materials T&O Test and Operations T&V Test and Verification T+ Time Postintegration T- Time Prior to Launch T-0 Time Zero T-0 Takeoff T.B. Toggle Buffer T.P. Transition Period T/A Turnaround T/C Telecommunications T/C Temperature Compensating T/C Termination Check T/C Thrust Chamber T/CAP Thermal Capacitor T/D Time Delay T/D Touchdown T/E Transporter/Erector T/L Talk and Listen T/L Timeline T/L Transformer Load T/O Takeover T/R Tape Recorder T/R Technical Report T/R Transformer Rectifier T/R Transmit/Receive T/R Transmitter/Receiver T/R Transportation Request T/R Turnaround RequiremLnts T/T Terminal Timing T/T Timing/Telemetry T/TCA Thrust/Translation Control Assembly T/V Thermal Vacuum T/W Thrust Weight T/W Thrust-to-Weight TA Task Agreement TA Task Analysis TA Test Article TA Time Actual TA Travel Authorization TA Trunnion Angle TAA Technical Assistance Agreement TAA Temporary Access Authorization TAA Temporary Area Access TAC Kennedy Space Center Landing Site, Florida TAC Tactical Air Command TAC Total Average Cost TAC/RA TACAN Radar Altimeter TACAN Tactical Air Command and Navigation System TACAN Tactical Air Navigation TACH Tachometer TACO Test and Checkout Operations TAD Temperature and Dewpoint TAEM Terminal Area Energy Management TAG Technical Air-to-Ground TAGS Text and Graphics System TAIR Test Assembly Inspection Record TAL Transatlantic Abort Landing TAL Transoceanic Abort Landing TALAR Tactical Approach and Landing Radar TAM Thermal Analytical Model TAN Tananarive, Madagascar (STDN Site) TAO Trans-Atlantic Abort TAP Technical Achievement Plan TAP Telemetry Acceptance Pattern TAP Test Administration Plan TAP Total Air Pressure TAR Technical Analysis Request TAR Test Action Requirement TAR Test Agency Report TAS Telemetry Antenna Subsystem TAS Test Article Specification TAS Tether Applications in Space TAS True Airspeed TARC Through Axis Rotational Control TASPR Technical and Schedule Performance Report TASPR Total Air Temperature TASPR Turnaround Time TATI Total Air Temperature Indicator TAT Technical Acceptance Team TB Talk Back TB Terminal Base TB Terminal Board TB Time Base TB Time Duration of Burn TB Toggle Buffer TBA To Be Added TBA To Be Announced TBC Terminal Buffer Controller TBD To Be Defined TBD To Be Determined TBD To Be Developed TBE To Be Escorted TBE To Be Evaluated TBF Test de Bon Fonctionnement (Spacelab) TBI Through-Bulkhead Initiator TBN To Be Negotiated TBP To Be Provided TBS Task Breakdown Structure TBS To Be Specified TBS To Be Superseded TC Telecommunications TC Temperature Compensating TC Test Conductor (Contractor) TC Test Conductor (Controller) TC Thermal Control TC Thermocouple TC Thiokol Corporation TC Thrust Chamber TC Time to Circular TC Traceability Code TC Tracking Camera TCA Time of Closest Approach TCA Thrust Chamber Assembly TCA Translation Controller Assembly TCAB Temperature of Cabin TCC Test Control Center TCC Thermal Control Coating TCD Test Completion Date TCD Test Control Document TCDT Terminal Countdown Demonstration Test TCE Thermal Canister Experiment TCF Tank Checkout Facility TCG Test Control Group TCG Time Code Generator TCI Technical Critical Item TCID Test Configuration Identifier Document TCID Test Control Identifier TCIR Total Case Incident Rate TCMD Transportation Control and Movement Document TCMS Test, Control and Monitor System TCN Test Change Notice TCN Transportation Control Number TCO Taken Care Of TCO Test and Checkout TCOP Test Checkout Plan(s) TCP Task Control Packet TCP Test Checkout Procedure TCP Test Control Package TCP Thrust Chamber Pressure TCP Transmission Control Protocol TCP/IP Transmission Control Protocol/Internet Protocol TCR Test Compare Results TCR Test Conductor TCR Test Constraints Review TCR Thermal Concept Review TCRSD Test and Checkout Requirements Spec. Documentation TCS Technical Change Summary TCS Technical Concurrence Sheets TCS Test Control Supervisor TCS Test Control System TCS Thermal Control System (Subsystem) TCSSS Thermal Control Subsystem Segment TCTI Time Compliance Technical Instruction TCTO Time Compliance Technical Order TCU Tape Control Unit TCV Temperature Control Voltage TCV Thrust Chamber Valve TD Technical Directive TD Terminal Distributor TD Test Director (NASA) TD Time Delay TD Touch Down TD&SA Telephone, Data, and Special Audio TDD Task Description Document TDM Time-Division Multiplexing (Multiplexer) TDP Temperature and Dewpoint TDP Tracking Data Processor TDR Technical Design Review TDR Technical Documentation Report TDR Test Discrepancy Report TDRR Test Data Recording and Retrieval TDRS Telemetry Downlist Receiving Site TDRS Tracking and Data Relay Satellite TDRSS Tracking and Data Relay Satellite System TDS Technology Demonstration Satellite TDS Test Data System TDU Time Display Unit TDV Test Data Van TDY Temporary Duty TE Test Equipment TE Time Earliest/Expected TE Timing Electronics TE Trailing Edge TEC Test Equipment Center TECH Technical TECH Technician TED Trailing Edge Down TELCOM Telecommunications TELESAT TELESAT (Canadian Payload, Communication Satellite) TEMP Temperature TEMP Test and Evaluation Master Plan TEMS Transport Environment Monitoring System TEOS Tetraethyl Orthosilicate TEP Technical Evaluation Panel TEP Test Evaluation Plan TER Test Equipment Readiness TER Time Estimating Relationship TERL Test Engineer Readiness List TERL Test Equipment Readiness List TERM Terminate TESH Technical Shop TET Test Evaluation Team TF Test Facility TF Test Fixture TFC Time From Cutoff TFCS Triplex Flight Control System (Subsystem) TFE Time From Event TFF Time to Free Fall TFI Time From Ignition TFL Telemetry Format Load TFL Time From Launch TFOV Total Field of View TFR Trouble and Failure Report TFS Telemetry Format Selection TFU Test Facility Utilization TG Ground Systems (KSC Directorate) TG Ground Systems, TS TGA Thermal Gravimetric Analysis TGA Trace Gas Analyzer TGO Time to Go TGOWG Teleoperator Ground Operations Working Group TGS Rate Gyro Assembly TGS Telemetry Ground Station TGS Telemetry Ground System TGS Triglycine Sulfate TGSE Telemetry Ground Support Equipment TGT Target THC Translation Hand Controller THC Translational Hand Controller THDS Time Homogeneous Data Set THEMIS Time History of Events and Macroscale Interactions During Substorms THEO Theoretical THERM Thermal THOLD Threshold THOUS Thousand THP Thrust Horsepower THROT Throttle TI Information Systems (KSC Directorate) TI Technical Integration TI Terminal Initiation Rendezvous Maneuver TI Training Integrator (Integration) TIC Technical Information Center TIC Total Item Change TICM Test Interface and Control Module TIE Technical Integration Engineer TIFS Total In-Flight Simulator TIG Time of Ignition TII Tooling Inspection Instrumentation TIM Technical Interchange Meeting TIM Time Interval Monitor TIO Target Insertion Orbit TIP Thrust Inlet Pressure TIP Time Interval Processor TIROS Topographical Infrared Operations Satellite TIS Test Interface Subsystem TISRS Tether Initiated Space Recovery System TISP Teacher in Space Project TK Tank TKSC Tsukuba Space Center TL Thrust Level TL Time Latest TL Traceability Lot TL Transient Load TLC Telecommand TLCE Transmission Line Conditioning Equipment TLD Thermoluminescent Dosimeter TLM Telemetry TLS Time Line Sheet TLS Top Left Side TLS Transport Layer Security TLSA Torso Limb Suit Assembly TLSCP Telescope TLV Threshold Limit Value TLV Transporter-Loader Vehicle TM Member Traceability TM Table Maintenance TM Technical Management TM Telemetry TM Time Management TM Traffic Model TMA Technology Mirror Assembly TMB Transportation Management Bulletin TMBU Table Maintenance Block Update TMC Test Monitoring Console TMECO Time of Main Engine Cutoff TMF Transporter Maintenance Facility TMG Thermal Meteoroid Garment TMI Technical Management Items TML Total Mass Loss TMM Thermal Math Model TMO Test Manufacturing Order TMO Tool Manufacturing Order TMP Terminal Panel TMP Time Management Processor TMPRY Temporary TMPV Torquemotor Pilot Valve TMR Timer TMU Temperature Measurement Unit TMV Thermal Margin Verification TN Technical Note TNL Tunnel TNT Trinitrotoluene TO Operations Management (KSC Directorate) TO Operations Management (TS) TO Takeoff TO Task Order TO Technical Order TOC Test Operations Center TOC Test Operations Change TOC Total Organic Carbon TOF Test Operations Facility TOG Toggle TOGA Tropical Ocean Global Atmosphere TOI Transfer Orbit Insertion TOL Tolerance TOO Test Operations Order TOO Threshold of Odor TOP Technical Operating Procedure TOP Tether Optical Phenomena TOPEX Topographical Explorer TOPS Transistorized Operational Phone System TOS Test Operating System TOS Transfer Orbit Stage TOT Total TOW Tank and Orbiter Weight TP Test Point TP Test Port TP Test Procedure TP Time to Perigee TP Training Plan TP Transition Period (T.P. preferred) TP True Position TP Turbo Pump TP Type TP&C Thermal Protection and Control TPA Test Preparation Area TPA Tilt Platform Assembly TPAD Trunnion Pin Attachment Device TPC Telemetry Preprocessor Computer TPDS Test Procedures Development System TPE Test Project Engineer TPF Terminal Phase Finalization (Braking) TPF Terminal Phase Finish TPF Transfer Phase Final TPF Tug Processing Facility TPI Terminal Phase Initiation TPM Technical Performance Measurement (System) TPM Terminal Phase Maneuver TPM Terminal Phase Midcourse TPM Transfer Phase Midcourse TPM1 Terminal Phase Midcourse #1 TPM2 Terminal Phase Midcourse #2 TPO Test Program Outline TPR Teleprinter TPR Test Problem Report TPS Test Preparation Sheet TPS Thermal Protection Subsystem TPS Thermal Protection System (SRB, ET, or Orbiter) TPS Twisted Pair Shielded TPSE Thermal Protection Subsystem Experiments TPUN Test Procedure Update Notice TR Technical Report TR Technical Review TR Test Request TR Thrust Reverser TR Time to Retrofire TR Transportation Request TR/SBS Teleoperator Retrieval/Skylab Boost System TR1 Payload Furnished Mars Tape Recorder (1 of 2) TR2 Payload Furnished Mars Tape Recorder (2 of 2) TRA Training Requirements Analysis TRA Turnaround Requirements Analysis TRACS Tool-Record Accountability System TRAJ Trajectory TRANS Transition TRANS Translation TRANSL Translation TRB Technical Review Board TRB Test Review Board TRBL Troubleshooting TRCP Tape Recorder Control Panel (LIO) TRD Test Requirements Document TReK Telescience Resource Kit TRF Tuned Radio Frequency TRK Track TRKR Tracker TRL Test Readiness List TRN Trunnion TRNG Training TRP Technical Review Panel TRQ Torque TRR Test Readiness Review TRRB Test Readiness Review Board TRS Teleoperator Retrieval System TRS Time Reference System TRS Top Right Side TRS Troubleshooting Record Sheet TRS Tug Rotational System TRSD Test Requirements Specification Document TRUN ANG Trunnion Angle TS Technical Support (KSC Directorate) TS Tensile Strength TS Test Site TS Test Stand TS Test Station TS Time Scheduled TS Timing System TS Traceability Serial TSA Test Start Approval TSAC Tracking System Analytical Calibration TSB Temporary Stowage Bag TSB Twin Sideband TSC Test Setup Complete TSC Test Support Coordinator TSC Two-Stage Command TSCION TSC 1/0 Number TSCO Test Support Coordination Office TSCO Test Support Coordinator TSCP Training Simulator Control Panel TSD Test Start Date TSE Transportation Support Equipment TSGP Test Sequence Generator Program (ESTEC) TSLD Troubleshooting Logic Diagram TSM Tail Service Mast TSM Trade Study Management TSO Time Sharing Option TSO Time Since Overhaul TSP Test Software Program TSP Twisted Shielded Pairs (Cables) TSR Technical Status Review TSR Test Status Report TSRA Total System Requirements Analysis TSS Time Sharing System TSS TPS Summary Sheet Control TSS Tug Structural Support TSSU Test Signal Switching Unit TST Test TSU Time Standard Unit TSW Test Software TSW Test Switch TT Terminal Timing TT Thrust Termination TT Total Temperature TT Total Time TT&C Tracking, Telemetry and Command TT&C Tracking, Telemetry and Control TTA Time to Apogee TTA Thermomechanical Test Area TTC Time To Circularize (Orbit) TTC Telemetry, Tracking, and Command TTC Tunnel Thermal Control TTCA Thrust Translation Controller Assembly TTCV Tracking Telemetry, Command, and Voice TTE Time To Event TTEL Tool and Test Equipment List TTG Time To Go TTL Transistor-Transistor Logic TTLM Through-the-Lens Light Metering TTP Time To Perigee TTSS Technical Training Scheduling System - (USA) TTSS Training Tracking Scheduling System - (PGOC) TTU Timing Terminal Unit TTV Termination, Test, and Verification TTY Teletype TU Technical Utilization TU Technology Utilization TU Transport Unit TUL Tula Peak, NM (STDN site) TURB Turbine TV Television TV Thermal Vacuum TV Thrust Vector TV Transport Vehicle TVA Thrust Vector Alignment TVAR Test Variance TVC Thermal Vacuum Chamber TVC Thrust Vector Control TVCA Thrust Vector Control Actuator TVCD Thrust Vector Control Driver TVCS Thrust Vector Control System TVEXPIS TV Experiment Interconnecting Station TVN Test Verification Network TVP Test Verification Program TVS Toxic Vapor Suit TVSA Thrust Vector Control Servoamplifier TVSSIS TV Subsystem Interconnecting Station TVT Thermal Vacuum Test TVTA Thermal Vacuum Test Article TW Tailwind TW Thumbwheel TW Time Words TW Traveling Wave TWD Twisted Double Shielded TWG Test Working Group TWL Total Weight Loss TWR Tower TWT Traveling Wave Tube TWT Trisonic Wind Tunnel (Rockwell) TWTA Traveling Wave Tube Amplifier TWU Transport Workers' Union TWX Teletype Wire Transmission TX Translation Hand Controller X-Axis Direction TX Transmit Channel TX/RX Transmitter/Receiver TY Translation Hand Controller Y-Axis Direction TYP Typical TZ Translation Hand Controller Z-Axis Direction U U Underfloor U Uranium U-SB Unified S-Band U/C Under Current U/D Update U/L Uplink (UPLK preferred) U/M Unit of Measure U/M Unmanned U/M Unscheduled Maintenance U/O Used on U/S Upper Stage U/S Upstream U/V Under Voltage U/W Used with UA Microampere UAB University of Alabama in Birmingham UARS Upper Atmosphere Research Satellite UB Upper Brace UB Utility Bridge UBE Universal Bus Exercisor UBIC Universal Bus Interface Controller UC Unsatisfactory Condition UCC Universal Checkout Console UCD Urine Collection Device UCN Uniform Control Number UCPU Urine Collection and Pretreatment Unit UCR Unsatisfactory Condition Report UCS Unified Control System UCS Uniform Coding System UCS Universal Control System UCS Utilities Control System UCTA Urine Collection Transfer Assembly UD Update UDB Update Buffer UDF Utility and Data Flow UDL Updata Link UDL Update Link UDMH Unsymmetrical Dimethylhydrazine UDMH/H Unsymmetrical Dimethylhydrazine Hydrazine Blend UDOP Ultrahigh Doppler UDS Universal Documentation System UER Unique Equipment Register UF Microfarad UFD User File Directory UG Microgram UHB User Home Base UHF Ultrahigh Frequency UHV Ultrahigh Vacuum UI Unit of Issue UI User Interface UIC User Identification Code UIO User Integration Office UIT Ultraviolet Imaging Telescope UKIRT United Kingdom Infrared Telescope UL Underload UL Uplink UL Upper Left (S-Band Antenna) UL Upper Limit ULA Fairbanks, Alaska (STDN Site) ULC Unpressurized Logistics Center ULE Ultralow Expansion ULEP Useful Life Extension Program ULL Ullage ULO Unmanned Launch Operations ULT Ultimate ULT Ultimate Load Test ULVIM Ultraviolet Limb Imaging UMB Umbilical UMBC Umbilical Cord Cable UMI Urine Monitoring Investigation UMO Unmanned Orbital UMS Urine Monitoring System UMVF Unmanned Vertical Flight UNBAL Unbalance UNDK Undock UNDV Undervoltage UNISAT United Satellite LTD UNIV Universal UNLCH Unlatch UNLK Unlock UOF User Operations Facility UP Unsolicited Proposal UP Upper UPLK Uplink UPN Unique Project Number UPP User Parameter Processing UPS Uninterruptible Power Supply UPS Uninterruptible Power System UPS Upright Perigee Stage UPTLM Uplink Telemetry UR Unsatisfactory Report UR Upper Right UR User Room URA Uniformly Redundant Array URA Urine Receptacle Assembly URD User Requirements Document URN Urine URT Upright US United States US Upper Stage USA United Space Alliance USA United States of America USA Upper Stage Adapter USAF United States Air Force USAFA United States Air Force Academy USB Unified S-Band USB Upper Side Band USBE Unified S-Band Equipment USBI United Space Boosters, Inc. USBS Unified S-Band System (Subsystem) USC United States Code USDA United States Department of Agriculture USE User Support Equipment USEC Microsecond USGS United States Geological Survey USI Update Software Identity USICU United States ISPR Checkout Unit USMC United States Marine Corps USML United States Microgravity Laboratory USMP United States Microgravity Payload USN United States Navy USNS United States Navy Ship USOC User Support and Operations Center USR User Support Room USRA Universities Space Research Association USS United States Ship USS United States Standard USS Utility Support Structure UST United States Testing (Company) UST Universal Servicing Tool UST Universal Standard Time USTDC University-affiliated Spaceport Technology Development Contract USV Upper Stage Vehicle UT Umbilical Tower UT Unit Tester UT Universal Time UT&GS Uplink Text and Graphics System UTC Unit Test Cases UTC United Technologies Corporation UTC United Technology Center UTC Universal Test Console UTC Universal Time Coordinated UTE Universal Test Equipment UTIL Utility UTLM Up Telemetry UTRC United Technology Research Center UTS Ultimate Tensile Strength UTS Urine Transfer System UU Micromicron (name micron obsolete); use um (micrometer) UUPIC Universal Uniform Personal Identification Code UUT Unit Under Test UV Microvolt (mV) UV Ultraviolet UV Under Voltage (U/V preferred) UVD Under Voltage Device UVF Unmanned Vertical Flight UVS Unmanned Vehicle System UVSP Ultraviolet Spectrometer and Polarimeter UVX Ultraviolet Cosmic Background Experiment UW Microwatt UWS User Work Station V V Valve V Velocity V Verb V Voice V Volt V Voltage V P-P Voltage Peak-to-Peak V&DA Video and Data Acquisition V&DA Video and Data (Processing) Assembly V&V Validation and Verification V-A Vibro-Acoustic V-A Volt-Ampere V-BAR Velocity Vectory Axis V-CITE Vertical-Cargo Integration Test Equipment V-RTIF Vandenberg Real Time Interface V/A video/Analog V/C Vector Control V/C Velocity Counter V/H Velocity-to-Height V/M Velocity Meter V/V Vent Valve V/V Validation and Verification (also V&V) VA Vibro-Acoustic Test VA Velocity at Apogee VA Volt Ampere VA/T/VTA Vibro-Acoustic/Thermal/Vacuum Test Article VAA Viewpoint Adapter Assembly VAA Vehicle Assembly Area VAB Vehicle Assembly Building VAB Vehicle Assembly Building VAC Volts, ac VAC Vehicle Assembly and Checkout VAC Vacuum VAD Vandenberg Addendum Document VAFB Vandenberg Air Force Base VAK Vertical Access Kit VAK Vertical Assembly Kit VAL Valid VALID Validation VAN USNS Vanguard (STDN) VAP Vapor VAR Variable, Variance, Variation VAR Verification Analysis Report VAR Volt Ampere Reactive VARM Vehicle Accident Report Meeting VASI Visual Approach Slope Indicator VAST Versatile Avionics System Tester VAT Vibro-Acoustic Test VATA Vibro-Acoustic Test Article VATF Vibration and Acoustic Test Facility VBSP Video Baseband Signal Processor VC Vector Character VC Velocity Counter VC Virtual Circuit VCAP Vehicle Charging and Potential Experiment VCB Vertical Location of the Center of Buoyancy VCC Verification Code Counter VCD Verification Control Document VCD(S) Vapor Compression Distillation (Subsystem) VCE Vehic VCG Vapor Crystal Growth VCG Vector Cardiogram VCG Vertical Location of the Center of Gravity VCGS Vapor Crystal Growth System VCI Velocity Change Indicator VCM Volatile Condensable Material VCN Verification Completion Notice VCO Voltage Controlled Oscillator (Oscillation) VCP Vandenberg Contract Report VCR Verification Complete Reports VCR Video Cassette Recorder VCRS Video Compression and Reconstruction System VCS Verification Control Sheet VCS Voice Command System VCT Voltage Control Transfer VCTR Vector VCU Video Control Unit VDA Valve Driver Assembly VDA Vapor Diffusion Apparatus VDA Variable Data Area VDB Verification Data Base Vdc Volts, dc VDD Verification Description Document VDD Version Description Document VDI Vendor Documentation Inventory VDI Vertical Display Indicator VDS Vehicle Dynamics Simulator VDT Vehicle Data Table VDT Video Display Terminal VDU Visual Display Unit VE Equivalent Velocity VE Shuttle Engineering (KSC VBO Directorate) VE Vehicle Engineering (KSC VBO Directorate) VECIB Vehicle Engineering Change Implementation Board VECO Vernier Engine Cutoff VECP Value Engineering Change Proposal VEDS Vehicle Emergency Detection System VEEGA Venus-Earth-Earth Gravity Assist (Trajectory Used for Galileo to Jupiter) VEEI Vehicle Electrical Engine Interface VEFCO Vertical Functional Checkout VEH Vehicle VEH ID Vehicle Identification VEI Vehicle End Item VEL Velocity VER Verify VERIF Verification VERLORT Very Long Range Tracking Radar VERN Vernier VERT Vertical VES Vacuum Exhaust System VF Vertical Flight VF Video Frequency VFE Vendor Furnished Equipment VFI Verification Flight Instrumentation VFM View Finder Monitor VFO Variable Frequency Oscillator VFR Visual Flight Rules VFT Verification Flight Test VGIMU Velocity To Be Gained as Related to IMU Orientation VGOR Vandenberg Ground Operations Requirement VGOR Vehicle Ground Operation Requirements VGP Vehicle Ground Point VGT Vehicle Ground Test VGVT Vertical Ground Vibration Test VGX Velocity To Be Gained (Body X-Axis) VGY Velocity To Be Gained (Body Y-Axis) VGZ Velocity To Be Gained (Body Z-Axis) VHAA Very High Altitude Abort VHF Very High Frequency VHF/AM Very High Frequency Amplitude Modulator VHF/DF Very High Frequency Direction Finder VHSIC Very High Speed Integrated Circuit VI Internal Velocity VIA By Means of (By Way of) VIB Vertical Integration Building VIB Vibrate, Vibration VIC Visitors Information Center VID Video VIDD Vertical Interval Data Detector VIL Verified Item List VIP Verification Integration Plan VIR Visible Infrared Radar VIRD Verification Implementation Requirements Document VIS Verification Information System VIS Visibility VIS Visual VIS/UV Visual/Ultraviolet VISC Viscosity ViTS Video Teleconferencing System VITT Vehicle Integration Test Team VIU Video Interface Unit VJ Vacuum Jacketed VLA Very Large Array VLBI Very Long Baseline Interferometer VLF Very Low Frequency VLPS Vandenberg Launch Processing System VLR Very Low Range VLS Vandenberg Launch and Landing Site VLV Value VLV Valve VM Virtual Memory VM Voltmeter VMF Vertical Maintenance Facility VMRR Vendor Material Review Report VMS Velocity Measuring System VO Shuttle Operations (KSC Directorate) VO Space Vehicle Operations (KSC Dir.) VO Vehicle Operations VO Velocity Initial VO Voice VOIR Venus Orbiter Imaging Radar VOL Volume VOLT-A Voltage Operating Limit Tests-A VOM Volt-ohm-meter VOMD VAFB Operations and Maintenance Documentation VOR VHF Omnidirectional Radio Range VOR-DME VHF Omni Range-UHF Distance Measuring Equipment VORTAC Variable Omni Range Tactical (VOR and TACAN) VORTAC VHF Omni Range Tactical Air Navigation VOT VHF Omni Test VOX Voice Operated Transmitter (Transmission) VP Shuttle Payloads (KSC VO Dir., see CO, CS, CV) VP Vacuum Pump VP Verification Polarization VP Vertical Polarization VP View Processor VP Viewpoint VPC Vapor Phase Compression VPF Vertical Processing Facility VPHD Vertical Payload Handling Device VPI Valve Position Indicator VPK Volts Peak VPM Vehicle Project Manager VPP Voluntary Protection Program VPPA Variable Polarity Plasma Arc VR Variable Reluctance VR Velocity, Relative VR Video Recorder VR Voltage Regulator VR Voltage Relay VRA Velocity Referenced Attitude VRB VHF Recovery Beacon VRCS Vernier Reaction Control System VREL Relative Velocity VRF Vertical Removal Fixture VRL Vertical Recovery Line VRL Vertical Reference Line VRMS Volts Root Mean Square VRNR Vernier VRR Verification Readiness Review VRS Vacuum Resource System VRSD Verification Requirements and Specification Document VS Staging Velocity VS Vestibular Sled (Spacelab D-1 Exp.) vs Versus VSA Variable Stability Aircraft VSA Verification Site Approval VSB Vestigial Side Band VSD Vertical Situation Display VSI Vertical Speed Indicator VSI Video Simulation Interface VSO Very Stable Oscillator VSTAG Vandenberg Shuttle Turnaround Analysis Group VSWR Visual Standing Wave Ratio VSWR Voltage Standing Wave Ratio VT STS Processing (KSC VO Dir.) VT Vent VT/FT Verification Test/Flight Test VTA Vehicle Test Area VTA Vertical Test Area VTE Variable Thrust Engine VTF Vertical Test Flight VTM Vibration Test Module VTM Virtual Team Meeting VTN Verification Test Network VTP Vehicle Test Plan VTP Verification Test Plan VTP Verification Test Program VTR Verification Text Reports VTR Videotape Recorder VTS Vandenberg Tracking Station VTS Vertical Test Site VTS Vertical Test Stand VTS Vertical Test System VTS Video Test Set VTVM Vacuum Tube Voltmeter VTX Vertex VU Vehicle Unit VU Vehicle Utility VU Volume Unit VUV Vacuum Ultraviolet VV Velocity Vector VV Vent Valve VV Vertical Velocity VVI Vertical Velocity Indicator VWFC Very Wide Field Camera VWG Verification Working Group VX Velocity Along the X-Axis VY Velocity along the Y-Axis VZ Velocity along the Z-Axis W W Watt W West W Wide W Window W&B Weight and Balance W&C Wire and Cable W-G Water-Glycol W/ With W/B Wideband W/E Wing Elevon W/G Water/Glycol W/h Watt-Hour W/O Without W/S Work Station W/T Wind Tunnel W/W Weather W/W Wheel Well W/W Wrist Yaw W/WMS Water/Waste Management System (Subsystem) WA Wide Angle WA Work Authorization WAD Work Authorization Document WAD/SO Work Authorization Document/Shop Order WAIS Wide Area Information Server WAMDII Wide Angle Michelson Doppler Imaging Inferometer WAN Wide Area Network WAN/ISP Wide Area Network/Internet Service Provider WAN Work Authorization Number WAR Work Authorization Report WARN Warning WAT Web Action Time WAVE WAD Authoring and Validation Environment WB Waterboiler WB Wet Bulb WB Wide Band WBC White Blood Cells WBDI Wideband Data Interleaver WBDS Wide Band Data Separator WBR Work Bench Rack WBS Work Breakdown Structure WBSC Wide-Band Signal Conditioner WBT Wide-Band Terminal WBTS Wide-Band Transmission System WCCS Window Contamination Control Number WCCU Wireless Communications Control Unit WCDB Work Control Data Base WCDDT Wet Countdown Demonstration Test WCL Water Coolant Line WCL Water Coolant Loop WCLS Water Coolant Loop System WCP Wing Chord Plane WCS Waste Collection System WCS Work Control System WCS Writable Control Storage WD Width WD Wired Discrete WD Word WD Work Days WEA Weather WEFAX Weather Facsimile WES Water Electrolysis System WETA Wireless Video System External Transceiver Assembly WETS Weightless Environment Training System WF Wide Field WF/PC Wide Field/Planetary Camera WFF Wallops Flight Facility WFPC Wide Field Planetary Camera WG Wage Grade WG Wave Guide WG Wing WGS Water Glycol Service Unit WHL Wheel Whr Watt-Hour WIB When Interrupt Block WIF Water Immersion Facility WIN Irwin, Australia WINDS Weather Information Network Display System WIP Work In Progress WISP Waves in Space Plasma WIX Wait for Index WL Wavelength WL Werkstofflabor (Spacelab D-1 Exp.) WLE Wing Leading Edge WM Waste Management WMC Waste Management Compartment WMS Waste Management System WND Wind WO Work Order WOC Work Order Control WOCE World Ocean Circulation Experiment WONG Weight on Nose Gear WORM Write Once-Read Many Technology WOSE Weather Office in Space Evaluation WOW Weight on Wheels WOW Worst on Worst WOWLON Weight on Wheels Lock On WP Way Point WP Work Package WP Working Pressure WP Wrist Pitch WPAFB Wright Patterson Air Force Base WPC Watts Per Candle WPD Work Package Description WPF Work Process Flow WPG Work Package Grouping WPI Work Process Indicator WPI Work Progress Indicator WPM Words Per Minute WPMCP Work Package Manpower and Cost Plan WPP Water Pump Package WPP Work Package Plan WPPS Work Package Planning Sheet WPS Words Per Second WR Weather Radar WR Wrist Roll WRG Wiring WRL Wing Reference Line WRM Water Recovery and Management WRO Work Release Order WS Water Servicer WS Wind Shield WS Work Statement WSB Water Spray Boiler WSC Wide-Band Signal Conditioner WSCC Work Station Control Center WSD Wide-Band Data WSGS White Sands Ground Station WSGT White Sands Ground Terminal WSM Waste Storage Module WSMC Western Space and Missile Center WSMR White Sands Missile Range WSO Water Servicer Operator WSSH White Sands Space Harbor WSTF White Sands Test Facility WSU Water Servicing Unit WSWR Variable Standing Wave Ratio (Rate) WT Watchdog Timer WT Weight WT Wire Ticket WTA Wire Traceability and Accountability WTR Water WTR Western Test Range WTR SYS Water System WTSC Wet Tantalum Slug Capacitor WTT Wind Tunnel Test WUC Work Unit Code WUCF Work Unit Code File WUPPE Wisconsin Ultraviolet Photo Polarimeter Experiment WUSCI Western Union Space Communications, Inc. WVCF Western Vehicle Checkout Facility WW Water Waste WW Wire Wrap WWMS Waste Water Management System WWW World Wide Web WX Weather WY Wrist Yaw X X Times (by, trans-) XL X-Axis of Spacelab XO X-Axis of Orbiter XP X-Axis of Payload XS X-Axis of Solid Rocket Booster XT X-Axis of External Tank XCVR Transceiver XDA X-Ray Detector Assembly XDCR Transducer XFD Crossfeed XFER Transfer XLTN Translation XMM X-Ray Multimission XMT Transmit XMTR Transmitter XNS Xerox Network Systems XO Orbiter Structural Body Reference, X-Axis XP Payload Structural Body Reference, X-Axis XPNDR Transponder XRCF X-Ray Calibration Facility XRD X-Ray Diffraction XRP X-Ray Polychromator XRS X-Ray Spectrometer XRT X-Ray Telescope XSST X-Ray Spectrometer/Spectrograph Telescope XTA X-Ray Telescope Assembly XTAL Crystal XTE X-Ray Timing Explorer XUV Extreme Ultraviolet (also EUV) Y Y Horizontal Axis-Width of Vehicle Y Lateral Acceleration Y Out-of-Plane Position Y Out-of-Plane Velocity Y Y-Axis Y Y-Axis, Horizontal-Width of Vehicle/Structure Y Y-Axis Rate of Change Y Yaw YL Y-Axis of Spacelab YO Y-Axis of Orbiter YP Y-Axis of Payload YS Y-Axis of Solid Rocket Booster YT Y-Axis of External Tank YAR Yarragadee (STDN Site) yd Yard YP Yield Pointer yr Year YS Yield Strength YSC Yearly Spares Cost YST Yearly Spares Cost YT Station Identification Symbol YV Deputy for Space Launch Systems YVC Directorate of Configuration and Information Management YVCB Configuration/Data Management Division YVGF Financial Management Division (SD) YVGR Requirements and Analysis Division (SD) YVV Directorate of Launch Base Operations YVV-1 Program Safety Office (SD) YVVE Engineering Division YVVI Inertial Upper Stage YVVL Integrated Logistics Support Division (SD) YVVO Operations Division YVVS DOD Mission Support Division, JSC (SD) Z Z Impedance Z Normal Acceleration (Load Factor) Z Z-Axis Direction Z Z-Axis Rate of Change Z Zone Z Zulu (Greenwich Mean Time--GMT) ZL Z-Axis of Spacelab ZO Z-Axis of Orbiter ZP Z-Axis of Payload ZS Z-Axis of Solid Rocket Booster ZT Z-Axis of External Tank ZBB Zero Base Budget ZC Zero Calibration ZCG Impedance Cargiogram ZGT Zero Gravity Trainer ZI Zone of Interior (Continental USA) ZIF Zero Insertion Force ZLV Z Local Vertical (Payload Bay Toward Earth) ZO Station Identification Symbol, Orbiter X-Axis ZOE Zone of Exclusion ZOP Zero Operational Ajont Code ZPN Impedance Cardiogram ZPN Impedance Pneumogram ZrO2 Zirconium Oxide ZSI Z Solar Inertial (Payload Bay Facing Away From Sun) |
| Page Last Revised | Page & Curator Information |
|---|---|
| November 25, 2008 | Curator: Kay Grinter (Kay.Grinter-1@ksc.nasa.gov) NASA Official: Jeanne Rybe (Jeanne.Ryba@ksc.nasa.gov) Web Development: JBOSC Web Development Team A service of the NASA/Kennedy Space Center External Relations Directorate: Lisa A. Malone, Director |
