AD 2006-12-10 Airworthiness Directives; Boeing Model 747-400 Series Airplanes

Models named: 747-400 series. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to Boeing Model 747-400 series airplanes, certificated in any category, as identified in Boeing Special Attention Service Bulletin 747-35-2114, Revision 1, dated June 7, 2007.

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 Corrective Action (f) At the compliance time specified in paragraph (f)(1) or (f)(2) of this AD as applicable, except as provided by paragraph (g) of this AD: Inspect the support bracket of the crew oxygen cylinder installation to determine the manufacturing date marked on the support, and do the corrective action as applicable, by doing all of the actions in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-35-2114, dated December 19, 2002; or Revision 1, dated June 7, 2007. Corrective action, if applicable, must be done before further flight after the inspection. After the effective date of this AD only Revision 1 of the service bulletin may be used. (1) For airplanes identified in Boeing Special Attention Service Bulletin 747-35-2114, dated December 19, 2002: Within 18 months after July 17, 2006 (the effective date of AD 2006-12-10). (2) For airplanes not identified in Boeing Special Attention Service Bulletin 747-35-2114, dated December 19, 2002: Within 18 months after the effective date of this AD. (g) If the configuration of the crew oxygen cylinder installation is changed from a one-cylinder to a two-cylinder configuration: Do the actions required by paragraph (f) of this AD before further flight after the change in configuration, or at the applicable time specified in paragraph (g)(1) or (g)(2), whichever is later. (1) For airplanes identified in Boeing Special Attention Service Bulletin 747-35-2114, dated December 19, 2002: Within 18 months after July 17, 2006. (2) For airplanes not identified in Boeing Special Attention Service Bulletin 747-35-2114, dated December 19, 2002: Within 18 months after the effective date of this AD. Parts Installation (h) At the time specified in paragraph (h)(1) or (h)(2) of this AD as applicable, no person may install an oxygen cylinder support bracket having part number 65B68258-2 and having a manufacturing date between 10/01/98 and 03/09/01 inclusive (meaning, a manufacturing date of 10/01/98 or later and 03/09/01 or earlier). (1) For airplanes identified in Boeing Special Attention Service Bulletin 747-35-2114, dated December 19, 2002: As of July 17, 2006. (2) For airplanes not identified in Boeing Special Attention Service Bulletin 747-35-2114, dated December 19, 2002: As of the effective date of this AD. Alternative Methods of Compliance (AMOCs) (i)(1) The Manager, Seattle Aircraft Certification Office (ACO), 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. (3) AMOCs approved previously in accordance with AD 2006-12-10, are approved as AMOCs for the corresponding provisions of paragraph (f) and (g) of this AD. Material Incorporated by Reference (j) You must use Boeing Special Attention Service Bulletin 747-35-2114, dated December 19, 2002; or Boeing Special Attention Service Bulletin 747-35-2114, Revision 1, dated June 7, 2007; as applicable; to perform the actions that are required by this AD, unless the AD specifies otherwise. (1) The Director of the Federal Register approved the incorporation by reference of Boeing Special Attention Service Bulletin 747-35-2114, Revision 1, dated June 7, 2007, in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. (2) On July 17, 2006 (71 FR 33604, June 12, 2006), the Director of the Federal Register approved the incorporation by reference of Boeing Special Attention Service Bulletin 747-35-2114, dated December 19, 2002. (3) Contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207, for a copy of this service information. You may review copies at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington 98057-3356; 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 April 14, 2008. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E8-8531 Filed 4-21-08; 8:45 am] BILLING CODE 4910-13-P

This AD results from a report indicating that certain oxygen cylinder supports may not have been properly heat-treated. We are issuing this AD to prevent failure of the oxygen cylinder support under the most critical flight load conditions, which could cause the oxygen cylinder to come loose and leak oxygen. Leakage of oxygen could result in oxygen being unavailable for the flightcrew or could result in a fire hazard in the vicinity of the leakage.