2008-10-11: Fuel tank systems

2008-10-11 Boeing: Amendment 39-15517. Docket No. FAA-2006-26710; Directorate Identifier 2006-NM-147-AD. \n\nEffective Date \n\n\t(a) This AD becomes effective June 12, 2008. \n\nAffected ADs \n\n\t(b) None. \n\nApplicability \n\n\t(c) This AD applies to all Boeing Model 757-200, -200PF, -200CB, and -300 series airplanes, certificated in any category. \n\n\tNote 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 (AMOC) according to paragraph (l) 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. \n\nUnsafe Condition \n\n\t(d) This AD results from a design review of the fuel tank systems. We are issuing this AD to prevent the potential for ignition sources inside fuel tanks caused by latent failures, alterations, repairs, or maintenance actions, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane. \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 Information \n\n\t(f) The term "Revision March 2008 of the MPD" as used in this AD, means Boeing Temporary Revision (TR) 09-008, dated March 2008. Boeing TR 09-008 is published as Section 9 of the Boeing 757 Maintenance Planning Document (MPD) Document, D622N001-9, Revision March 2008. \n\nRevision of Airworthiness Limitations (AWLs) Section \n\n\t(g) Before December 16, 2008,revise the AWLs section of the Instructions for Continued Airworthiness (ICA) by incorporating the information in the subsections specified in paragraphs (g)(1) through (g)(3) of this AD into the MPD; except that the initial inspections specified in Table 1 of this AD must be done at the compliance times specified in Table 1. Accomplishing the revision in accordance with a later revision of the MPD is an acceptable method of compliance if the revision is approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA. \n\n\t(1) Subsection E, "AIRWORTHINESS LIMITATIONS--FUEL SYSTEMS," of Revision March 2008 of the MPD. \n\n\t(2) Subsection F, "PAGE FORMAT: SYSTEMS AIRWORTHINESS LIMITATIONS," of Revision March 2008 of the MPD. \n\n\t(3) Subsection G, "AIRWORTHINESS LIMITATIONS--FUEL SYSTEM AWLs," AWLs No. 28-AWL-01 through No. 28-AWL-24 inclusive, of Revision March 2008 of the MPD. As an optional action, AWLs No. 28- AWL-25 and No. 28-AWL-26, as identified in Subsection G of Revision March 2008 of the MPD, also may be incorporated into the AWLs section of the ICA. \n\nInitial Inspections and Repair \n\n\t(h) Do the inspections specified in Table 1 of this AD at the compliance time specified in Table 1 of this AD, and repair any discrepancy, in accordance with Section G of Revision March 2008 of the MPD. The repair must be done before further flight. Accomplishing the actions in accordance with a later revision of the MPD is an acceptable method of compliance if the revision is approved by the Manager, Seattle ACO. Accomplishing the inspections identified in Table 1 of this AD as part of an FAA-approved maintenance program before the applicable compliance time specified in Table 1 of this AD constitutes compliance with the requirements of this paragraph. \n\n\t\t\t\tTable 1.--Initial Inspections\n\n\n\n\n\nCompliance Time\n(whichever occurs later)\n\nAWL No.\n\nDescription\nThreshold\nGrace Period\n(1) 28-AWL-01\nA detailed inspection of external wires over the center fuel tank for damaged clamps, wire chafing, and wire bundles in contact with the surface of the center fuel tank\nWithin 120 months since the date of issuance of the original standard airworthiness certificate or the date of issuance of the original export certificate of airworthiness\nWithin 72 months after the effective date of this AD.\n(2) 28-AWL-03\nA special detailed inspection of the lightning shield to ground termination on the out-of-tank fuel quantity indicating system to verify functional integrity\nWithin 120 months since the date of issuance of the original standard airworthiness certificate or the date of issuance of the original export certificate of airworthiness\nWithin 24 months after the effective date of this AD.\n(3) 28-AWL-14\nA special detailed inspection of the fault current bond of the fueling shutoff valve actuator of the center wing tank to verify electrical bond\nWithin 120 months since the date of issuance of the original standard airworthiness certificate or the date of issuance of the original export certificate of airworthiness\nWithin 60 months after the effective date of this AD.\n\n\n\tNote 2: For the purposes of this AD, a detailed inspection is: "An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirror, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate procedures may be required." \n\n\tNote 3: For the purposes of this AD, a special detailed inspection is: "An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. The examination is likely to make extensive use of specialized inspection techniques and/or equipment. Intricate cleaning and substantial access or disassembly procedure may be required." \n\nNo Alternative Inspections, Inspection Intervals, or Critical Design Configuration Control Limitations (CDCCLs) \n\n\t(i) After accomplishing the actions specified in paragraphs (g) and (h) of this AD, no alternative inspections, inspection intervals, or CDCCLs may be used unless the inspections, intervals, or CDCCLs are part of a later revision of "Revision March 2008 of the MPD" that is approved by the Manager, Seattle ACO; or unless the inspections, intervals, or CDCCLs are approved as an AMOC in accordance with the procedures specified in paragraph (l) of this AD. \n\nCredit for Actions Done According to Previous Revisions of the MPD \n\n\t(j) Actions done before the effective date of this AD in accordance with Section 9 of the Boeing 757 MPD Document, D622N001- 9, Revision March 2006; Revision October 2006; Revision January 2007; or Revision November 2007; are acceptable for compliance with the corresponding requirements of paragraphs (g) and (h) of this AD. \n\nTerminating Action for AD 2008-06-03, Amendment 39-15415 \n\n\t(k)Incorporating AWLs No. 28-AWL-23, No. 28-AWL-24, and No. 28- AWL-25 into the AWLs section of the ICA in accordance with paragraph (g) of this AD terminates the action required by paragraph (h)(2) of AD 2008-06-03. \n\nAlternative Methods of Compliance (AMOCs) \n\n\t(l)(1) The Manager, Seattle ACO, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19. \n\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(m) You must use Boeing Temporary Revision (TR) 09-008, dated March 2008, to the Boeing 757 Maintenance Planning Document (MPD) Document, D622N001-9, to perform the actions that are required bythis AD, unless the AD specifies otherwise. Boeing TR 09-008 is published as Section 9 of the Boeing 757 Maintenance Planning Document (MPD) Document, D622N001-9, Revision March 2008. \n\n\t(1) The Director of the Federal Register approved the incorporation by reference of this document in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. \n\n\t(2) Contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207, for a copy of this service information. \n\n\t(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/cfr/ibr- locations.html.