AD 2009-26-04 Airworthiness Directives; Boeing Model 737-600, -700, -700C, -800, and -900 Series Airplanes

Models named: 737-600, -700, -700C, -800, -900 series. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to Boeing Model 737-600, -700, -700C, -800, and -900 series airplanes, certificated in any category, as identified in Boeing Service Bulletin 737-32-1376, Revision 2, dated August 6, 2008.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Lubrication or Overhaul (g) Within 30 days after the effective date of this AD: Lubricate the left and right MLG forward trunnion pins in accordance with the Accomplishment Instructions of Boeing Service Bulletin 737-32-1376, Revision 2, dated August 6, 2008. Repeat the lubrication at intervals not to exceed 30 days until all applicable requirements of paragraphs (h) and (i) of this AD have been accomplished. Overhauling the trunnion pin in accordance with the Accomplishment Instructions of Boeing Service Bulletin 737-32-1376, Revision 2, dated August 6, 2008, ends the repetitive lubrication requirements of this paragraph for that pin. Inspection and Corrective Actions (h) Within 60 months after the date of issuance of the original airworthiness certificate or date of issuance of the original export certificate of airworthiness, or within 6 months after the effective date of this AD, whichever occurs later: Do a detailed inspection for discrepancies (corrosion, finish damage, surface deformation, or scratches) of the transition radius of the left and right MLG trunnion pins with MLG not removed (in situ); and if any discrepancy is found, repair or replace the trunnion pin before further flight. Do all actions in accordance with the Accomplishment Instructions of Boeing Service Bulletin 737-32-1376, Revision 2, dated August 6, 2008. If the repair specified in Part 4 of the Accomplishment Instructions of Boeing Service Bulletin 737-32-1376, Revision 2, dated August 6, 2008, is done, within 24 months after doing the repair, do the detailed inspection of the transition radius, and do the inspection thereafter at intervals not to exceed 24 months until the trunnion pin is overhauled or replaced in accordance with the Accomplishment Instructions of Boeing Service Bulletin 737-32-1376, Revision 2, dated August 6, 2008. (i) For airplanes on which the trunnion pin has not been replaced or overhauled: Within 120 months after the date of issuance of the original airworthiness certificate or date of issuance of the original export certificate of airworthiness, or within 6 months after the effective date of this AD, whichever occurs later, do a detailed inspection for discrepancies of the lead-in chamfer and cross-bolt bore with the MLG removed; and if any discrepancy is found, repair or replace the trunnion pin before further flight. Do all actions in accordance with the Accomplishment Instructions of Boeing Service Bulletin 737-32-1376, Revision 2, dated August 6, 2008. No Report Required (j) Although Boeing Service Bulletin 737-32-1376, Revision 2, dated August 6, 2008, specifies to send inspection reports to the manufacturer, this AD does not include that requirement. Credit for Actions Done Using Previous Issue of Service Information (k) Actions done before the effective date of this AD in accordance with Boeing Special Attention Service Bulletin 737-32-1376, dated May 12, 2005; or Boeing Service Bulletin 737-32-1376, Revision 1, dated March 19, 2007; are acceptable for compliance with the corresponding actions of this AD. Alternative Methods of Compliance (AMOCs) (l)(1) The Manager, Seattle 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: Nancy Marsh, Aerospace Engineer, Airframe Branch, ANM-120S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone (425) 917-6440; fax (425) 917-6590. Or, e-mail information to 9-ANM-Seattle-ACO-AMOC-Requests@faa.gov . (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 principal maintenance inspector (PMI) or principal avionics inspector (PAI), as appropriate, or lacking a principal inspector, your local Flight Standards District Office. The AMOC approval letter must specifically reference this AD. (3) An AMOC that provides an acceptable level of safety may be used for any repair required by this AD, if it is approved by an Authorized Representative for the Boeing Commercial Airplanes Delegation Option Authorization Organization who has been authorized by the Manager, Seattle ACO, to make those findings. For a repair method to be approved, the repair must meet the certification basis of the airplane, and the approval must specifically refer to this AD. Material Incorporated by Reference (m) You must use Boeing Service Bulletin 737-32-1376, Revision 2, dated August 6, 2008, 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 Boeing Commercial Airplanes, Attention: Data & Services Management, P. O. Box 3707, MC 2H-65, Seattle, Washington 98124-2207; telephone 206-544-5000, extension 1; fax 206-766-5680; e-mail me.boecom@boeing.com ; Internet https://www.myboeingfleet.com . (3) You may review copies of the service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington. For information on the availability of this material at the FAA, call 425-227-1221 or 425-227-1152. (4) You may also review copies of the service information that is incorporated by reference 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 . Issued in Renton, Washington, on December 4, 2009. Michael J. Kaszycki, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E9-29964 Filed 12-24-09; 8:45 am] BILLING CODE 4910-13-P

This AD results from a report that the protective finishes on the forward trunnion pins for the left and right main landing gear (MLG) might have been damaged during final assembly. We are issuing this AD to prevent cracking of the forward trunnion pin, which could result in fracture of the pin and consequent collapse of the MLG.