AD 2007-20-02 Airworthiness Directives; Viking Air Limited Model DHC-7 Airplanes

Models named: DHC-7-1, DHC-7-100, DHC-7-101, DHC-7-102, DHC-7-103. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to all Viking Air Limited Model DHC-7-1, DHC-7-100, DHC-7-101, DHC-7-102, and DHC-7-103 airplanes, certificated in any category.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Inspection and Modification (f) Within 12 months after the effective date of this AD: Inspect the SM-200 power servo motor and housing assembly, part numbers 4006719-904, -913 and -933, to determine if MOD H is marked, and before further flight, do all applicable related investigative action and modifications of the power servo motor and housing assembly, in accordance with the Accomplishment Instructions of Viking Alert Service Bulletin 7-22-20, dated May 29, 2006. Note 1: The alert service bulletin refers to Honeywell Alert Service Bulletin 4006719-22-A0016 (Pub. No. A21-1146-008), Revision 001, dated November 1, 2004, as an additional source of service information for doing the inspection, related investigative action, and modifications. Alternative Methods of Compliance (AMOCs) (g)(1) The Manager, New York Aircraft Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19. (2) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. 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. Related Information (h) Canadian airworthiness directive CF-2006-18, dated July 17, 2006, also addresses the subject of this AD. Material Incorporated by Reference (i) You must use Viking Alert Service Bulletin 7-22-20, dated May 29, 2006, to perform the actions that are required by this AD, unless the AD specifies otherwise. The Director of the Federal Register approved the incorporation by reference of this document in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Viking Air Limited, 9574 Hampden Road, Sidney, British Columbia V8L 5V5, Canada, for a copy of this service information. You may review copies at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; 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. Issued in Renton, Washington, on September 19, 2007. John Piccola, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E7-18863 Filed 9-25-07; 8:45 am] BILLING CODE 4910-13-P

This AD results from a report that some SM-200 servo drive units (power servo motor and housing assemblies) that were not in configuration MOD H are installed on Model DHC-7 airplanes. MOD H prevents the possibility of internal clutch fasteners from backing out. We are issuing this AD to prevent the internal clutch fasteners from backing out, which could cause an inadvertent servo engagement and consequent reduced controllability of the airplane.