2008-03-01: Structural components

2008-03-01 Viking Air Limited: Amendment 39-15350; Docket No. FAA- 2007-27192; Directorate Identifier 2007-CE-008-AD. Effective Date (a) This airworthiness directive (AD) becomes effective March 6, 2008. Affected ADs (b) This AD supersedes AD 83-02-02, Amendment 39-4553. Applicability (c) This AD applies to Models DHC-6-1, DHC-6-100, DHC-6-200, and DHC-6-300 airplanes, all serial numbers, certificated in any category. Subject (d) Air Transport Association of America (ATA) Code 51: Structures. Reason (e) The mandatory continuing airworthiness information (MCAI) refers to the Product Support Manual (PSM) 1-6-11, Revision 5, dated January 11, 2000, which states: Certain structural components must be replaced by new components at a certain stage of the aircraft's life to avoid any possibility of fatigue failure. The MCAI requires you to inspect, modify, and/or retire affected structural components to maintain the structural integrityof DHC-6 airplanes. Actions and Compliance (f) Unless already done, within 30 days after March 6, 2008 (the effective date of this AD), for all aircraft, incorporate the inspections, modifications, and/or retirement of components specified in Bombardier Inc.(formerly de Havilland) DHC-6 "Twin Otter'' PSM 1-6-11, Revision 6, dated March 28, 2007, into the aircraft maintenance program. The compliance times are specified in the manual. For aircraft that are approaching or have exceeded the threshold of the new or revised inspections introduced by this AD, compliance with the threshold inspection may be modified as detailed below: (1) Pre Mod 6/1117 Wing Assemblies: (i) If the last inspection done of the main wing spar attachment lug fastener holes, before March 6, 2008 (the effective date of this AD), was an eddy current inspection following Bombardier Inc. (formerly de Havilland) DHC-6 "Twin Otter'' PSM 1-6-11, Revision 5, dated January 11, 2000; or PSM 1-6-11, Revision6, dated March 28, 2007; do the repeat high frequency eddy current inspection in accordance with the schedule in PSM 1-6-11, Revision 6, dated March 28, 2007. (ii) If the last inspection done of the main wing spar attachment lug fastener holes, before March 6, 2008 (the effective date of this AD), was an ultrasonic inspection following Bombardier Service Bulletin 6/525, dated September 6, 1996, do the first high frequency eddy current inspection within 1,000 hours time-in-service (TIS) or 2000 cycles, whichever occurs first, after the last ultrasonic inspection. Repetitively inspect thereafter in accordance with the schedule in PSM 1-6-11, dated March 28, 2007. Note 1: Operators that do not have landing (or cycle) records may determine the number of landings (or cycles) by dividing the number of hours of time-in-service of each airplane by the time of the average flight for the aircraft of that type in the operator's fleet. (2) Post Mod 6/1117 and Post Mod 6/1630 Wing Assemblies: If the inspection threshold for the lower wing skin, stringers, and aft spar lower flange WS122 to WS263 (ribs 8 to 20) has been exceeded or will be exceeded within 6 months after March 6, 2008 (the effective date of this AD), do the first high frequency eddy current inspection within the next 500 hours TIS after March 6, 2008 (the effective date of this AD), or within the next 6 months after March 6, 2008 (the effective date of this AD), whichever occurs first, following PSM 1-6-11, Revision 6, dated March 28, 2007. (g) You may take "unless already done'' credit if the above actions were done following the procedures described in Bombardier Inc. (formerly de Havilland) DHC-6 "Twin Otter'' PSM 1-6-11, Revision 5, dated January 11, 2000. FAA AD Differences Note 2: This AD differs from the MCAI and/or service information as follows: The MCAI references PSM 1-6-11, Revision 5, dated January 11, 2000. PSM 1-6-11, Revision 6, dated March 28, 2007, has since been issued and is referenced for compliance in this AD. Other FAA AD Provisions (h) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification Office, 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: George Duckett, Aerospace Engineer, Airframe and Propulsion Branch, FAA, New York Certification Office, 1600 Stewart Avenue, suite 410, Westbury, New York 11590; telephone: (516) 228-7325; 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 (i) Refer to MCAI Transport Canada AD No. CF-2000-14, dated May 25, 2000; and Viking Air Limited Structural Components Service Life Limits Manual PSM 1-6-11, Revision 6, dated March 28, 2007, for related information. Material Incorporated by Reference (j) You must use PSM 1-6-11, Revision 6, dated March 28, 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 this serviceinformation under 5 U.S.C. 552(a) and 1 CFR part 51. (2) For service information identified in this AD, contact Bombardier Inc., Bombardier Regional Aircraft Division, Garratt Boulevard, Downsview, Ontario, Canada M3K 1Y5; telephone: (416) 633- 7310. (3) 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/code_of_federal_regulations/ibr_locations.html.