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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 adding the following new airworthiness directive (AD): \n\n2019-23-04 The Boeing Company: Amendment 39-19797; Docket No. \n\n((Page 72230)) \n\nFAA-2016-9072; Product Identifier 2015-NM-110-AD. \n\n(a) Effective Date \n\n\n\tThis AD is effective February 4, 2020. \n\n(b) Affected ADs \n\n\n\tNone. \n\n(c) Applicability \n\n\n\tThis AD applies to The Boeing Company Model 727, 727-100, 727C, 727-100C, 727-200, and 727-200F series airplanes; certificated in any category; equipped with Boeing body-mounted auxiliary fuel tanks. \n\n(d) Subject \n\n\n\tAir Transport Association (ATA) of America Code 28, Fuel. \n\n(e) UnsafeCondition \n\n\n\tThis AD was prompted by the FAA's analysis of the Model 727 fuel system review conducted by the manufacturer. The FAA is issuing this AD to address ignition sources inside the body-mounted auxiliary fuel tanks, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane. \n\n(f) Compliance \n\n\n\tComply with this AD within the compliance times specified, unless already done. \n\n(g) Modification \n\n\n\tWithin 12 months after the effective date of this AD, do the actions specified in either paragraph (g)(1) or (2) of this AD, using a method approved in accordance with the procedures specified in paragraph (h) of this AD. \n\t(1) Modify the fuel quantity indicating system (FQIS) to prevent development of an ignition source inside the body-mounted auxiliary fuel tanks due to electrical fault conditions. \n\t(2) Deactivate the body-mounted auxiliary fuel tanks. \n\n(h) Alternative Methods of Compliance (AMOCs)(1) The Manager, Seattle ACO Branch, 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 certification office, send it to the attention of the person identified in paragraph (i) of this AD. Information may be emailed to: 9-ANM-Seattle-ACO-AMOC-Requests@faa.gov. \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, modification, or alteration required by this AD if it is approved by The Boeing Company Organization Designation Authorization (ODA) that has been authorized by the Manager, SeattleACO Branch, FAA, 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. \n\n(i) Related Information \n\n\n\tFor more information about this AD, contact Jon Regimbal, Aerospace Engineer, Propulsion Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 206-231- 3557; email: Jon.Regimbal@faa.gov. \n\n(j) Material Incorporated by Reference \n\n\n\tNone.
