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2007-23-08 Boeing: Amendment 39-15254. Docket No. FAA-2007-28380; Directorate Identifier 2007-NM-088-AD. \n\nEffective Date \n\n\t(a) This AD becomes effective December 20, 2007. \n\nAffected ADs \n\n\t(b) None. \n\nApplicability \n\n\t(c) This AD applies to the Boeing airplane models, certificated in any category, identified in the service bulletins specified in Table 1 of this AD. \n\n\tTable 1.--Applicability of This AD \n\n\nBoeing Model - \nAs identified in Boeing Special Attention Service Bulletin - \n747-400, 747-400D, and 747-400F series airplanes\n747-26-2281, dated July 24, 2006\n757-200 series airplanes\n757-26-0051, dated July 28, 2006\n767-200, -300, and -300F series airplanes\n767-26-0131, dated July 24, 2006\n\n\nUnsafe Condition \n\n\t(d) This AD results from a report indicating that failure of a time delay relay on a Boeing Model 777 ELMS (electrical load management system) panel led to testing of other time delay relays at Boeing and at the supplier. Similar relays are used in the cargo fire suppression system. The time delay relay controls when the secondary fire bottles discharge. We are issuing this AD to ensure there is sufficient fire suppressant to control a cargo fire if the airplane is more than the relay delay time from a suitable airport, which could result in an uncontrollable fire in the cargo compartment. \n\nCompliance \n\n\t(e) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. \n\nService Bulletin Reference \n\n\t(f) The term "service bulletin,'' as used in this AD, means the Accomplishment Instructions of the following service bulletins, as applicable: \n\t(1) For Model 747-400, 747-400D, and 747-400F series airplanes: Boeing Special Attention Service Bulletin 747-26-2281, dated July 24, 2006; \n\t(2) For Model 757-200 series airplanes: Boeing Special Attention Service Bulletin 757-26-0051, dated July 28, 2006; and \n\t(3) For Model 767-200, -300, and -300F series airplanes: Boeing Special Attention Service Bulletin 767-26-0131, dated July 24, 2006. \n\nInspection \n\n\t(g) Within 24 months after the effective date of this AD: Do a general visual inspection of the part number (P/N) TDH6103-1204, - 1804, and -6003 time delay relay, as applicable, in the main equipment center to determine if the relay was manufactured during a certain date range, in accordance with the applicable service bulletin. \n\nReplacement \n\n\t(h) Within 30 days after finding a relay manufactured during the date range specified in the service bulletin, as required by paragraph (g) of this AD: Replace the relay with a relay that was not manufactured during the specified date range, or with a relay that has been tested by the supplier and found to be unaffected by thermal expansion, in accordance with the applicable service bulletin. \n\nParts Installation \n\n\t(i) As of the effective date of this AD, no person may install a time delay relay, P/N TDH6103-1204, -1804, or -6003, on any airplane if the relay has a date code between 0000 and 0343 and does not have an additional date code with the letter "T.'' \n\nAlternative Methods of Compliance (AMOCs) \n\n\t(j)(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. \n\t(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. \n\nMaterial Incorporated by Reference \n\n\t(k) You must use the service bulletins listed in Table 2 of this AD, as applicable, to perform the actions that are required by this AD, unless the AD specifies otherwise. The Director of the Federal Register approved the incorporation by reference of these documents in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. 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; 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 . \n\n\tTable 2.--Material Incorporated by Reference\n\n\nBoeing Special Attention Service Bulletin\nDate\n747-26-2281\nJuly 24, 2006\n757-26-0051\nJuly 28, 2006\n767-26-0131\nJuly 24, 2006
