2008-24-14: Landing gear trunnion

2008-24-14 Bombardier, Inc. (Formerly Canadair): Amendment 39-15758. Docket No. FAA-2008-1258; Directorate Identifier 2008-NM-142-AD. Effective Date (a) This airworthiness directive (AD) becomes effective December 19, 2008. Affected ADs (b) None. Applicability (c) This AD applies to all Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes, certificated in any category. Note 1: This AD requires revisions to certain operator maintenance documents to include new inspections. Compliance with these inspections is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by these inspections, the operator may not be able to accomplish the inspections described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an alternative method of compliance according to paragraph (g)(1) of this AD. The request should include a description of changes to the required inspections that will ensure the continued operational safety of the airplane. The FAA has provided guidance for this determination in Advisory Circular (AC) 25-1529-1A. Subject (d) Air Transport Association (ATA) of America Code 32: Landing Gear. Reason (e) The mandatory continuing airworthiness information (MCAI) states: Cracks on the main landing gear trunnion fitting web have been discovered during fatigue testing. Failure of the main landing gear trunnion fitting web could compromise the structural integrity of the trunnion fitting and result in a main landing gear collapse. A Temporary Revision has been made to the Bombardier CL-600-2B19 Maintenance Requirements Manual, Appendix B, "Airworthiness Limitations'' to ensure that fatigue cracking of the trunnion fitting web is detected and corrected. The corrective action is revising the Airworthiness Limitations Section of the Instructions for Continued Airworthiness to incorporate new structural inspection requirements. Actions and Compliance (f) Unless already done, do the following actions. (1) Within 30 days after the effective date of this AD, revise the Airworthiness Limitations Section (ALS) of the Instructions for Continued Airworthiness to incorporate the Airworthiness Limitation (AWL) No. 57-21-161, as identified in Bombardier Temporary Revision 2B-2136, dated May 1, 2008, to the Bombardier CL-600-2B19 Maintenance Requirements Manual, Part 2, Appendix B--Airworthiness Limitations. The initial compliance time for the task starts from the applicable time specified in Table 1 or Table 2 of this AD, as applicable. Repeat the inspection thereafter at the applicable interval specified in Bombardier Temporary Revision 2B-2136, dated May 1, 2008. Table 1--Pre-Modsum TC601R15827 Airplanes If the airplane has accumulated (as of the effective date of this AD) Then phase in the initial inspection 23,500 total flight cycles orfewer Prior to the accumulation of 25,000 total flight cycles 23,501 to 25,000 total flight cycles Prior to the accumulation of 26,000 total flight cycles, or within 1,500 flight cycles after the effective date of this AD, whichever occurs first 25,001 to 26,000 total flight cycles Prior to the accumulation of 26,500 total flight cycles, or within 1,000 flight cycles after the effective date of this AD, whichever occurs first 26,001 or more total flight cycles Within 500 flight cycles after the effective date of this AD Table 2--Post-Modsum TC601R15827 Airplanes If the airplane has accumulated (as of the effective date of this AD) Then phase in the initial inspection 15,667 total flight cycles or fewer Prior to the accumulation of 16,667 total flight cycles 15,668 to 16,667 total flight cycles Prior to the accumulation of 17,333 total flight cycles, or within 1,000 flight cycles after the effective date of this AD, whichever occurs first 16,668 to 17,333total flight cycles Prior to the accumulation of 17,666 total flight cycles, or within 666 flight cycles after the effective date of this AD, whichever occurs first 17,334 or more total flight cycles Within 333 flight cycles after the effective date of this AD (2) After accomplishing the actions specified in paragraph (f)(1) of this AD, no alternative inspections or inspection intervals may be used unless the inspection or inspection interval is approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (g)(1) of this AD. FAA AD Differences Note 2: This AD differs from the MCAI and/or service information as follows: No differences. Other FAA AD Provisions (g) 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: Pong K. Lee, Aerospace Engineer, Airframe and Propulsion Branch, ANE-171, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228-7324; 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, the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120- 0056. (4) Special Flight Permits: Special flight permits, as described in Section 21.197 and Section 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199), are not allowed. Related Information (h) Refer to MCAI Canadian Airworthiness Directive CF-2008-21, dated June 12, 2008; and Bombardier Temporary Revision 2B-2136, dated May 1, 2008, to the Bombardier CL-600-2B19 Maintenance Requirements Manual, Part 2, Appendix B--Airworthiness Limitations; for related information. Material Incorporated by Reference (i) You must use Bombardier Temporary Revision 2B-2136, dated May 1, 2008, to the Bombardier CL-600-2B19 Maintenance Requirements Manual, Part 2, Appendix B--Airworthiness Limitations Section, 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 service information under 5 U.S.C. 552(a) and 1 CFR part 51. (2) For service information identified in this AD, contact Bombardier, Inc., 400 C[ocirc]te-Vertu Road West, Dorval, Qu[eacute]bec H4S 1Y9, Canada; telephone 514-855-5000; fax 514-855- 7401; e-mail [email protected]; Internet http:// www.bombardier.com. (3) 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/code_of_ federal_regulations/ibr_locations.html.