TO:  ALL AIRWAY FACILITIES DIVISION MANAGERS

ATTN:  AIRWAY FACILITIES SECTOR MANAGERS

SUBJ:  ERRORS IN MODE-S SYSTEM SUPPORT DIRECTIVE SSM-MODES-010

TWX:  TWX-MODES-0001

DATE:  4/20/00

THE SSM-MODES-010 HAS THE FOLLOWING ERRORS:
 
1. ON PAGE 2, PARAGRAPH 7b. THE NSN NUMBER SHOULD BE 8200-00-001-1873-1.  
   NOTE THAT SITE SHOULD NOT ORDER THE BVR UNTIL CONTACTED BY AOS-260 OR 
   BY 472 FROM THE REGIONAL OFFICE.  THEN SITE WILL NEED TO CONTACT 
   LOGISTICS SPECIALIST FROM THE REGIONAL OFFICE TO ORDER THIS SINCE IT 
   IS F&E STOCK.

2. ON PAGE 9, PARAGRAPH 16, THE RESULT OF MODIFICATION SHOULD BE READ 
   AS FOLLOW:

	16. RESULT OF MODIFICATION.

	a. THE MODE-S SYSTEM WILL BE ABLE TO OPERATE IN FULL MODE-S 
	   MODE OF OPERATION AT COLLOCATED ASR-7/8 FACILITIES.

	b. REDUCTION OF FALSE TARGETS.

	c. SELECTIVE INTERROGATIONS AND MONOPULSE TRACKING ACCURACY.

IF YOU HAVE ANY FURTHER QUESTIONS REGARDING THIS MESSAGE, PLEASE 
CONTACT THANH NGUYEN, AOS-260, (609)485-HELP.



JAMES D. PRITCHARD
MANAGER, NATIONAL AIRWAY SYSTEMS
  ENGINEERING DIVISION, AOS-200