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 Federal Register Information
 Header Information
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2008-0444; Directorate Identifier 2008-CE-024-AD;
Amendment 39-15555; AD 2008-12-12]
RIN 2120-AA64
Airworthiness Directives; Viking Air Limited Models DHC-2 Mk. I, DHC-2 Mk. II, and DHC-3 Airplanes
PDF Copy (If Available):
Preamble Information
Regulatory Information
2008-12-12 Viking Air Limited: Amendment 39-15555; Docket No. FAA- 2008-0444; Directorate Identifier 2008-CE-024-AD.
Effective Date
(a) This airworthiness directive (AD) becomes effective July 23, 2008.
Affected ADs
(b) This AD supersedes AD 2004-21-06, Amendment 39-13827.
Applicability
(c) This AD applies to the following model and serial number airplanes certificated in any category:
Model | Serial No. |
| DHC-2 Mk. I | All |
| DHC-2 Mk. II. | All |
| DHC-3. | All serial numbers with piston engines |
Subject
(d) Air Transport Association of America (ATA) Code 74: Engine Ignition.
Reason
(e) The mandatory continuing airworthiness information (MCAI) states:
A complete loss of both ignition systems occurred on a DHC-3 Otter when the lock wire hole in the ignition connector plug on the firewall broke out, allowing the plug to vibrate loose. A maintenance safety feature grounds out both magneto systems through a spring-loaded safety pin incorporated into the Cannon plug. The DHC-2 system is similar in design.
Subsequent to the issuance of AD CF-2001-36 a complete loss of both ignition systems occurred on a DHC-2 Beaver resulting in engine failure and subsequent forced approach and landing. Investigation by the Transportation Safety Board determined the internal failure of the magneto firewall connector resulted in both magneto "P'' leads shorting to ground. A maintenance "safety'' feature through a spring-loaded safety pin incorporated in the firewall connector on many DHC-2 aircraft ground out both magneto systems when the connector is disconnected. This connector type is readily identified when disconnected by the existence of three internal pins on the firewall and magneto harness side, one of which is shorted directly to ground.
These connectors are no longer in production.
Since no effective Instructions for Continued Airworthiness exist to ensure the safety feature of these connectors will operate correctly when disconnected, or will ensure the internal integrity of the connector while in service, this directive is revised to mandate replacement of connectors with a different design.
Viking Air Limited has developed SB V2/0001 to provide for the installation of a replacement connector, similar in design to magneto systems in service today. This modification incorporates a "straight through'' type connector, ensuring magneto circuit integrity should the connection open.
Actions and Compliance
(f) Inspect the connector plugs on the fore side of the firewall for security and the connector plug lockwire to assure it is intact and the holes in the plugs are not broken out or cracked. Initially inspect within the next 100 hours time-in-service (TIS) after December 6, 2004 (the compliance date retained from AD 2004-21-06). Repetitively inspect thereafter at intervals not to exceed 100 hours TIS until the modification required in paragraph (h) of this AD is done. Do the inspections following deHavilland Beaver Alert Service Bulletin Number A2/53, Revision B, dated May 28, 2004; and deHavilland Otter Alert Service Bulletin Number A3/53, Revision B, dated May 28, 2004, as applicable.
(g) During any inspection required in paragraph (f) of this AD, if the lockwire holes or the lockwire is found damaged, install Modification Kit Number C2VMK0001-1 or Modification Kit Number C3VMK0001-1, as applicable. Install the modification kit before further flight following the Accomplishment Instructions in Viking DHC-2 Beaver Service Bulletin Number V2/0001, dated June 27, 2007; and Viking DHC-3 Otter Service Bulletin Number V3/0001, dated June 27, 2007, as applicable. Installing the modification kit terminates the repetitive inspections required in paragraph (f) of this AD.
(h) Unless already done, replace the magneto firewall connector by installing Modification Kit Number C2VMK0001-1 or Modification Kit Number C3VMK0001-1, as applicable. Install the modification kit within the next 6 months after July 23, 2008 (the effective date of this AD) following the Accomplishment Instructions in Viking DHC-2 Beaver Service Bulletin Number V2/0001, dated June 27, 2007; and Viking DHC-3 Otter Service Bulletin Number V3/0001, dated June 27, 2007, as applicable. Installing the modification kit terminates the repetitive inspections required in paragraph (f) of this AD.
FAA AD Differences
Note: This AD differs from the MCAI and/or service information as follows: AD 2004-21-06 required incorporating repetitive inspections of the connector plugs and the connector plug lockwire on the fore side of the firewall into the maintenance program while the MCAI required incorporating Temporary Revision No. 14, dated August 24, 2001, into the applicable maintenance manual in order to incorporate the repetitive inspections into the maintenance program.
Other FAA AD Provisions
(i) The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Fabio Buttitta, Aerospace Engineer, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone: (516) 228-7303; fax: (516) 794- 5531. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO.
(2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service.
(3) Reporting Requirements: For any reporting requirement in this AD, under the provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et.seq.), the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120-0056.
Related Information
(j) Refer to MCAI Transport Canada AD No. CF-2001-36R1, dated January 21, 2008; Transport Canada AD No. CF-2001-37R, dated January 21, 2008; deHavilland Beaver Alert Service Bulletin Number A2/53, Revision B, dated May 28, 2004; deHavilland Otter Alert Service Bulletin Number A3/53, Revision B, dated May 28, 2004; Viking DHC-2 Beaver Service Bulletin Number V2/0001, dated June 27, 2007; and Viking DHC-3 Otter Service Bulletin Number V3/0001, dated June 27, 2007, for related information.
Material Incorporated by Reference
(k) You must use deHavilland Beaver Alert Service Bulletin Number A2/53, Revision B, dated May 28, 2004; deHavilland Otter Alert Service Bulletin Number A3/53, Revision B, dated May 28, 2004; Viking DHC-2 Beaver Service Bulletin Number V2/0001, dated June 27, 2007; and Viking DHC-3 Otter Service Bulletin Number V3/0001, dated June 27, 2007, to do the actions required by this AD, unless the AD specifies otherwise.
(1) The Director of the Federal Register approved the incorporation by reference of Viking DHC-2 Beaver Service Bulletin Number V2/0001, dated June 27, 2007; and Viking DHC-3 Otter Service Bulletin Number V3/0001, dated June 27, 2007, under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) On December 6, 2004 (69 FR 61758, October 21, 2004), the Director of the Federal Register previously approved the incorporation by reference of deHavilland Beaver Alert Service Bulletin Number A2/53, Revision B, dated May 28, 2004; and deHavilland Otter Alert Service Bulletin Number A3/53, Revision B, dated May 28, 2004.
(3) For service information identified in this AD, contact Viking, 9574 Hampden Road, Sidney, British Columbia, Canada V8L 5V5.
(4) You may review copies at the FAA, Central Region, Office of the Regional Counsel, 901 Locust, Room 506, Kansas City, Missouri 64106; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal- register/cfr/ibr-locations.html.
Footer Information
Issued in Kansas City, Missouri, on June 5, 2008.
David R. Showers,
Acting Manager, Small Airplane Directorate,
Aircraft Certification
Service.
[FR Doc. E8-13112 Filed 6-17-08; 8:45 am]
BILLING CODE 4910-13-P
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