AD 2008-08-25 Airworthiness Directives; Boeing Model 747-400F and -400 Series Airplanes

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

This AD applies to Boeing Model 747-400F airplanes as identified in Boeing Alert Service Bulletin 747-25A3370, Revision 1, dated April 27, 2006; and Model 747-400 series airplanes as identified in Boeing Alert Service Bulletin 747-25A3526, dated November 13, 2007; 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. Installation (f) Within 24 months after the effective date of this AD, install two drains and drain tubes in the dripshield above the M826 Card File over the nose wheel left side in the main equipment center at station 400, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 747-25A3370, Revision 1, dated April 27, 2006 (for Model 747-400F series airplanes); or Boeing Alert Service Bulletin 747-25A3526, dated November 13, 2007 (for Model 747-400 series airplanes). Installation According to Previous Issue of Service Bulletin (g) Installing the drains and drain tubes is also acceptable for compliance with the requirements of paragraph (f) of this AD if done before the effective date of this AD in accordance with Boeing Alert Service Bulletin 747-25A3370, dated September 8, 2005. Alternative Methods of Compliance (AMOCs) (h)(1) The Manager, Seattle 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) Before using any AMOC approved in accordance with § 39.19 on any airplane to which the AMOC applies, notify the appropriate principal inspector in the FAA Flight Standards Certificate Holding District Office. Material Incorporated by Reference (i) You must use Boeing Alert Service Bulletin 747-25A3370, Revision 1, dated April 27, 2006; or Boeing Alert Service Bulletin 747-25A3526, dated November 13, 2007; as applicable; 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, P.O. Box 3707, Seattle, Washington 98124-2207. (3) You may review copies of the service information incorporated by reference 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 . Issued in Renton, Washington, on April 7, 2008. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E8-8327 Filed 4-18-08; 8:45 am] BILLING CODE 4910-13-P

This AD results from a report that water from the dripshield entered the card file and damaged a circuit card, causing the AFT CARGO FIRE MSG message to be illuminated and resulting in an air turn back. We are issuing this AD to prevent water from entering the card file and damaging a circuit card. Failure of one or more of the 15 fuel system circuit cards in the card file could cause loss of fuel management, which could cause unavailability of fuel. Failure of one or more of the 35 fire detection circuit cards could cause a false message of a fire, or no message of a fire when there is a fire.