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2017-10-22 |
THE BOEING COMPANY: Amendment 39-18896; Docket No. FAA-2016-9434; Directorate Identifier 2016-NM-136-AD. |
(a) EFFECTIVE DATE This AD is effective June 27, 2017. (b) AFFECTED ADS None. (c) APPLICABILITY (1) This AD applies to The Boeing Company Model 737-600, -700, -700C, -800 and -900 series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 737-53A1353, dated July 21, 2016. (2) Installation of Supplemental Type Certificate (STC) ST00830SE [http:// rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/184DE9A71EC3FA 5586257EAE00707DA6?OpenDocument&Highlight=st00830se] does not affect the ability to accomplish the actions required by this AD. Therefore, for airplanes on which STC ST00830SE is installed, a "change in product" alternative method of compliance (AMOC) approval request is not necessary to comply with the requirements of 14 CFR 39.17. (d) SUBJECT Air Transport Association (ATA) of America Code 53, Fuselage. (e) UNSAFE CONDITION This AD was prompted by an evaluation by the design approval holder (DAH) indicating that the web lap splices in the aft pressure bulkhead are subject to widespread fatigue damage (WFD). We are issuing this AD to detect and correct cracks of the web lap splices in the aft pressure bulkhead, which could result in possible rapid decompression and loss of structural integrity of the airplane. (f) COMPLIANCE Comply with this AD within the compliance times specified, unless al- ready done. (g) REPETITIVE INSPECTIONS Except as provided by paragraph (h) of this AD, at the applicable time specified in paragraph 1.E., "Compliance," of Boeing Alert Service Bulletin 737-53A1353, dated July 21, 2016: Do a low frequency eddy current (LFEC) inspection to detect cracking of each web lap splice of the aft pressure bulkhead at the fastener row common to the stiffener, and a high frequency eddy current (HFEC) inspection to detect cracking of each web lap splice of the aft pressure bulkhead at the fastener row not common to the stiffener, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 737-53A1353, dated July 21, 2016. (1) If no crack is found: Repeat the inspections thereafter at the applic- able times specified in paragraph 1.E., "Compliance," of Boeing Alert Service Bulletin 737-53A1353, dated July 21, 2016. (2) If any crack is found: Do the actions specified in paragraphs (g)(2) (i) and (g)(2)(ii) of this AD. (i) Repair the crack before further flight using a method approved in accordance with the procedures specified in paragraph (i) of this AD. Although Boeing Alert Service Bulletin 737-53A1353, dated July 21, 2016, specifies to contact Boeing for repair instructions, and speci- fies that action as "RC" (Required for Compliance), this AD requires repair as specified in this paragraph. (ii) On areas that are not repaired, repeat the inspections thereafter at the applicable times specified in paragraph 1.E., "Compliance," of Boeing Alert Service Bulletin 737-53A1353, dated July 21, 2016. (h) SERVICE INFORMATION EXCEPTION Where paragraph 1.E., "Compliance," of Boeing Alert Service Bulletin 737-53A1353, dated July 21, 2016, specifies a compliance time "after the Original Issue date of this Service Bulletin," this AD requires compliance within the specified compliance time after the effective date of this AD. (i) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS) (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. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the ACO, send it to the attention of the person identified in paragraph (j) of this AD. Information may be emailed to: 9-ANM-Seattle-ACO-AMOC-Requests@faa.gov. (2) Before using any approved AMOC, notify your appropriate principal in- spector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office. (3) An AMOC that provides an acceptable level of safety may be used for any repair, modification, or alteration required by this AD if it is approved by the Boeing Commercial Airplanes Organization Designation Authorization (ODA) that has been authorized by the Manager, Seattle ACO, to make those findings. To be approved, the repair method, modification deviation, or alteration deviation must meet the certification basis of the airplane, and the approval must specifically refer to this AD. (4) Except as required by paragraph (g)(2)(i) of this AD: For service in- formation that contains steps that are labeled as RC, the provisions of paragraphs (i)(4)(i) and (i)(4)(ii) of this AD apply. (i) The steps labeled as RC, including substeps under an RC step and any figures identified in an RC step, must be done to comply with the AD. If a step or substep is labeled "RC Exempt," then the RC requirement is removed from that step or substep. An AMOC is required for any deviations to RC steps, including substeps and identified figures. (ii) Steps not labeled as RC may be deviated from using accepted methods in accordance with the operator's maintenance or inspection program without obtaining approval of an AMOC, provided the RC steps, includ- ing substeps and identified figures, can still be done as specified, and the airplane can be put back in an airworthy condition. (j) RELATED INFORMATION For more information about this AD, contact Alan Pohl, Aerospace Engineer, Airframe Branch, ANM-120S, FAA, Seattle ACO, 1601 Lind Ave- nue SW, Renton, WA 98057-3356; phone: 425-917-6450; fax: 425-917-6590; email: alan.pohl@faa.gov. (k) MATERIAL INCORPORATED BY REFERENCE (1) The Director of the Federal Register approved the incorporation by reference (IBR) of the service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this service information as applicable to do the actions required by this AD, unless the AD specifies otherwise. (i) Boeing Alert Service Bulletin 737-53A1353, dated July 21, 2016. (ii) Reserved. (3) For service information identified in this AD, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA 90740; telephone: 562-797-1717; Internet: https://www.myboeingfleet.com. (4) You may view this service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, WA. For information on the availability of this material at the FAA, call 425-227-1221. (5) You may view this 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/cfr/ibr- locations.html. Issued in Renton, Washington, on May 10, 2017. Jeffrey E. Duven, Manager, Transport Airplane Directorate, Aircraft Certification Service. FOR FURTHER INFORMATION CONTACT: Alan Pohl, Aerospace Engineer, Airframe Branch, ANM-120S, FAA, Seattle Aircraft Certification Office (ACO), 1601 Lind Avenue SW., Renton, WA 98057-3356; phone: 425-917-6450; fax: 425-917- 6590; email: alan.pohl@faa.gov.
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