2026-22-04: Fuel

1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. 2. The FAA amends § 39.13 by: a. Removing Airworthiness Directive (AD) 2023-07-09, Amendment 39-22411 (88 FR 22895, April 14, 2023); and b. Adding the following new AD: 2026-22-04 The Boeing Company: Amendment 39-23506; Docket No. FAA-2026-7215; Project Identifier AD-2025-01558-T. (a) Effective Date This airworthiness directive (AD) is effective December 7, 2026. (b) Affected ADs This AD replaces AD 2023-07-09, Amendment 39-22411 (88 FR 22895, April 14, 2023) (AD 2023-07-09). (c) Applicability This AD applies to The Boeing Company Model 747-400 and -8 series airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletin 747-28A2373 RB, dated November 6, 2025. (d) Subject Air Transport Association (ATA) of America Code 28, Fuel. (e) Unsafe Condition This AD was prompted by reports of wear-through of the transfer pump motor impeller inlet adapter of the horizontal stabilizer fuel tank transfer pump caused by contact between the transfer pump housing inlet check valve and the inlet adapter. The FAA is issuing this AD to address the development of an ignition source within the horizontal stabilizer fuel tank resulting from wear to the transfer pump housing inlet check valves and transfer pump motor impeller inlet adapters of the horizontal stabilizer fuel tank. The unsafe condition, if not addressed, could, in combination with flammable fuel vapors, result in a fuel tank explosion and consequent loss of the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Required Actions Except as specified by paragraph (h) of this AD: At the applicable times specified in the "Compliance" paragraph of Boeing Alert Requirements Bulletin 747-28A2373 RB, dated November 6, 2025, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 747-28A2373 RB, dated November 6, 2025. Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 747-28A2373, dated November 6, 2025, which is referred to in Boeing Alert Requirements Bulletin 747-28A2373 RB, dated November 6, 2025. (h) Exceptions to Requirements Bulletin Specifications Where the Compliance Time column of the tables in the "Compliance" paragraph of Boeing Alert Requirements Bulletin 747-28A2373 RB, dated November 6, 2025, refers to the original issue date of Requirements Bulletin 747-28A2373 RB, this AD requires using the effective date of this AD. (i) Parts Installation Limitation As of the effective date of this AD, no person may install, on any airplane, a Crane Aerospace Hydro-Aire horizontal stabilizer fuel transfer pump housing, transfer pump housing inlet check valve, or transfer pump motor impeller into the horizontal stabilizer fuel tank unless the transfer pump housing inlet check valve and transfer pump motor impeller inlet adapter have been inspected as specified in paragraph (g) of this AD, as applicable, and been determined to be a serviceable part as defined in Boeing Alert Requirements Bulletin 747-28A2373 RB, dated November 6, 2025. (j) Special Flight Permit Special flight permits may be issued in accordance with 14 CFR 21.197 and 21.199 to operate the airplane to a location where the actions required by this AD can be performed, provided the horizontal stabilizer fuel tank is defueled and both transfer pump circuit breakers are locked in the "open" position. (k) Alternative Methods of Compliance (AMOCs) (1) The Manager, AIR-520, Continued Operational Safety 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 responsible Flight Standards 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 (l)(1) of this AD. Information may be emailed to: [email protected]. Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office. (2) 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, AIR-520, Continued Operational Safety 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. (l) Additional Information (1) For more information about this AD, contact Samuel Dorsey, Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 206-231-3415; email: [email protected]. (2) Material identified in this AD that is not incorporated by reference is available at the address specified in paragraph (m)(3) of this AD. (m) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference of the material listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this material as applicable to do the actions required by this AD, unless the AD specifies otherwise. (i) Boeing Alert Requirements Bulletin 747-28A2373 RB, dated November 6, 2025. (ii) [Reserved] (3) For Boeing material identified in this AD, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA 90740-5600; telephone 562-797-1717; website myboeingfleet.com. (4) You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 206-231-3195. (5) You may view this material at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations or email [email protected]. Issued on October 26, 2026. Brian Knaup, Acting Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service. [FR Doc. 2026-22317 Filed 10-30-26; 8:45 am]BILLING CODE 4910-13-P