2016-23-02: Nacelles/pylons

Adoption of the Amendment \n\n\n\tAccordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: \n\nPART 39--AIRWORTHINESS DIRECTIVES \n\n0 1. The authority citation for part 39 continues to read as follows: \n\n\n\tAuthority: 49 U.S.C. 106(g), 40113, 44701. \n\n\n\nSec. 39.13 (Amended) \n\n0 2. The FAA amends Sec. 39.13 by removing Airworthiness Directive (AD) 2006-19-12, Amendment 39-14769 (71 FR 55727, September 25, 2006), and adding the following new AD: \n\n2016-23-02 The Boeing Company: Amendment 39-18709; Docket No. FAA- 2015-5809; Directorate Identifier 2015-NM-055-AD. \n\n(a) Effective Date \n\n\n\tThis AD is effective December 30, 2016. \n\n(b) Affected ADs \n\n\n\tThis AD replaces AD 2006-19-12, Amendment 39-14769 (71 FR 55727, September 25, 2006) (''AD 2006-19-12''). \n\n(c) Applicability \n\n\n\tThis AD applies to The Boeing Company Model 777-200, -200LR, - 300, -300ER, and 777F series airplanes, certified in any category,as identified in Boeing Special Attention Service Bulletin 777-54- 0038, dated March 6, 2015; except for line number 940. \n\n(d) Subject \n\n\n\tAir Transport Association (ATA) of America Code 54, Nacelles/ pylons. \n\n(e) Unsafe Condition \n\n\n\tThis AD was prompted by a report that an aft fairing lower spar web exceeded the allowable conductivity limits. An investigation concluded that wear to the pan casting and gap cover strips allowed increased heat into the aft fairing heat shield cavity. We are issuing this AD to detect and correct degradation of the aft fairing lower web, which could lead to cracking of the web and could allow flammable fluids to leak into the heat shield pan castings, and increase the risk of an uncontained fire and subsequent structural damage. \n\n(f) Compliance \n\n\n\tComply with this AD within the compliance times specified, unless already done. \n\n(g) Retained Inspection, Installation, and Replacement Actions, With No Changes \n\n\n\tThis paragraph restates the actions required by paragraph (f) of AD 2006-19-12, with no changes. For Model 777-200 and -300 series airplanes identified in Boeing Special Attention Service Bulletin 777-54-0021, Revision 1, dated March 16, 2006: Except as provided by paragraph (h) of this AD, within 12 months after October 30, 2006 (the effective date of AD 2006-19-12), do the actions specified in paragraphs (g)(1), (g)(2), (g)(3), and (g)(4) of this AD, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 777-54-0021, Revision 1, dated March 16, 2006. \n\t(1) Do a general visual inspection of the lower web of the aft fairing for any discoloration and do any related investigative action. \n\t(2) Do a general visual inspection of the heat shield castings for any damage (crack(s), dent(s), gouge(s), warpage, fretting, or missing/loose nutplates). \n\t(3) Install gap cover strips on the heat shield pans. \n\t(4) Replace insulation blankets on the heat shield pans with newinsulation blankets. \n\n(h) Retained Repair Instructions, With No Changes \n\n\n\tThis paragraph restates the actions required by paragraph (g) of AD 2006-19-12, with no changes. If any damage, discoloration, heat damage, or crack is found during any inspection required by paragraph (g) of this AD: Before further flight, do all applicable corrective actions, in accordance with a method approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, or in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 777-54-0021, Revision 1, dated March 16, 2006. \n\n(i) Retained Credit for Previous Actions, With Revised Format \n\n\n\tThis paragraph restates the credit provided by paragraph (h) of AD 2006-19-12, with a revised format. This paragraph provides credit for actions required by paragraph (g) of this AD, if those actions were performed before October 30, 2006 (the effective date of AD 2006-19-12), using Boeing Special \n\n((Page 85133)) \n\nAttention Service Bulletin 777-54-0021, dated June 23, 2005, except where Boeing Special Attention Service Bulletin 777-54-0021, dated June 23, 2005, does not provide an international annealed copper standard (IACS) value for determining the results of the inspection for heat damage, the maximum acceptable IACS value is 42 percent. \n\n(j) New Requirements: Detailed and Conductivity Inspections and Related Investigative and Corrective Actions (Repetitive Inspections for Certain Airplanes) \n\n\n\t(1) For Group 1, Configurations 1, 2, 3, and 4, airplanes; and Group 2, Configurations 1 and 2, airplanes; identified in Boeing Special Attention Service Bulletin 777-54-0038, dated March 6, 2015: Within 24 months after the effective date of this AD, do a detailed inspection of the aft fairing lower structure for any cracking and deformation, and do a conductivity inspection of the aft fairing lower structure for the IACS value (thermal degradation indication), as applicable, and do all applicable related investigative and corrective actions, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 777-54- 0038, dated March 6, 2015. Do all applicable related investigative and corrective actions before further flight. \n\t(2) For Group 1, Configurations 1 and 3, airplanes, and Group 2, Configuration 1, airplanes, identified in Boeing Special Attention Service Bulletin 777-54-0038, dated March 6, 2015: Repeat the inspections specified in paragraph (j)(1) of this AD thereafter at intervals not to exceed 24 months until the terminating action specified in paragraph (k) of this AD is done. \n\n(k) Optional Terminating Action \n\n\n\tAccomplishing a detailed inspection of the gap cover strips and heat shield pan castings for damage and applicable corrective actions, and installation of new gap cover strip fillers, new Velcro strips, and improved aft fairing insulation blankets with new batting material, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777-54-0026, Revision 2, dated January 5, 2012, prior to or concurrently with accomplishing detailed and conductivity inspections and all applicable related investigative and corrective actions required by paragraph (j)(1) of this AD, terminates the repetitive inspections specified in paragraph (j)(2) of this AD; except, where Boeing Service Bulletin 777-54-0026, Revision 2, dated January 5, 2012, specifies to contact the manufacturer, repair using a method approved in accordance with the procedures specified in paragraph (m) of this AD. \n\n(l) Credit for Previous Actions \n\n\n\tThis paragraph provides credit for the actions specified in paragraph (k) of this AD that are identified in Boeing Service Bulletin 777-54-0026, Revision 2, dated January 5, 2012, if those actions were performed before the effective date of this AD using Boeing Service Bulletin 777-54-0026, dated March 29, 2011; or Boeing Service Bulletin 777-54-0026, Revision 1, dated August 23, 2011. \n\n(m) Alternative Methods of Compliance (AMOCs) \n\n\n\t(1) The Manager, Seattle 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 (n)(1) of this AD. Information may be emailed to: [email protected]. \n\t(2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office. \n\t(3) An AMOC that provides an acceptable level of safety may be used for any repair 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. For a repair method to be approved, the repair must meet the certification basis of airplane, and the approval must specifically refer to this AD. \n\t(4) AMOCs approved for AD 2006-19-12 are approved as AMOCs for the corresponding provisions of paragraphs (g), (h), and (i) of this AD. \n\t(5) For service information that contains steps that are labeled as Required for Compliance (RC), the provisions of paragraphs (m)(5)(i) and (m)(5)(ii) of this AD apply. \n\t(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. \n\t(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, including substeps and identified figures, can still be done as specified, and the airplane can be put back in an airworthy condition. \n\n(n) Related Information \n\n\n\t(1) For more information about this AD, contact Sue Lucier, Aerospace Engineer, Propulsion Branch, ANM-140S, FAA, Seattle ACO, 1601 Lind Avenue SW., Renton, WA 98057-3356; telephone: 425-917- 6438; fax: 425-917-6590; email: [email protected]. \n\t(2) Service information identified in this AD that is not incorporated by reference is available at the addresses specified in paragraphs (o)(5) and (o)(6) of this AD. \n\n(o) Material Incorporated by Reference \n\n\n\t(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. \n\t(2) You must use this service information as applicable to do the actions required by this AD, unlessthe AD specifies otherwise. \n\t(3) The following service information was approved for IBR on December 30, 2016. \n\t(i) Boeing Service Bulletin 777-54-0026, Revision 2, dated January 5, 2012. \n\t(ii) Boeing Special Attention Service Bulletin 777-54-0038, dated March 6, 2015. \n\t(4) The following service information was approved for IBR on October 30, 2006, Amendment 39-14769 (71 FR 55727, September 25, 2006). \n\t(i) Boeing Special Attention Service Bulletin 777-54-0021, Revision 1, dated March 16, 2006. \n\t(ii) Reserved. \n\t(5) For Boeing service information identified in this AD, contact Boeing Commercial Airplanes, Attention: Data & Services Management, P.O. Box 3707, MC 2H-65, Seattle, WA 98124-2207; telephone 206-544-5000, extension 1; fax 206-766-5680; Internet https://www.myboeingfleet.com. \n\t(6) You may view this service information at 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. \n\t(7) 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.