2026-09-01: Water/waste

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) 2023-08-04, Amendment 39-22419 (88 FR 33823, May 25, 2023); and b. Adding the following new AD: 2026-09-01 The Boeing Company: Amendment 39-23321; Docket No. FAA-2025-1114; Project Identifier AD-2025-00314-T. (a) Effective Date This airworthiness directive (AD) is effective June 3, 2026. (b) Affected ADs This AD replaces AD 2023-08-04, Amendment 39-22419 (88 FR 33823, May 25, 2023) (AD 2023-08-04). (c) Applicability This AD applies to The Boeing Company Model 787-8, 787-9, and 787-10 airplanes, certificated in any category, as specified in Boeing Alert Requirements Bulletin B787-81205-SB380021-00 RB, Issue 001, dated August 12, 2022. (d) Subject Air Transport Association (ATA) of America Code 38, Water/waste. (e) Unsafe Condition This AD was prompted by reports of a loss of water pressure during flight and water leaks that affected multiple pieces of electronic equipment, and by the determination that some clamshell couplings for certain lavatory and galley doors did not have a required safety strap. The FAA is issuing this AD to prevent the unsafe condition, which, if not addressed, could lead to water leaks and water migration to critical flight equipment, which may affect the continued safe flight and landing of the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Retained Clamshell Coupling Inspection, With No Changes This paragraph restates the requirements of paragraph (g) of AD 2023-08-04, with no changes. Except as specified by paragraph (h) of this AD: At the applicable times specified in the "Compliance" paragraph of Boeing Alert Requirements Bulletin B787-81205-SB380021-00 RB, Issue 001, dated August 12, 2022, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin B787-81205-SB380021-00 RB, Issue 001, dated August 12, 2022. Note 1 to paragraph (g): Guidance for accomplishing the actions required by paragraph (g) of this AD can be found in Boeing Alert Service Bulletin B787-81205-SB380021-00, Issue 001, dated August 12, 2022, which is referred to in Boeing Alert Requirements Bulletin B787-81205-SB380021-00 RB, Issue 001, dated August 12, 2022. (h) Retained Exception to Service Information Specifications, With No Changes This paragraph restates the exception of paragraph (h) of AD 2023-08-04, with no changes. Where the Compliance Time columns of the table in the "Compliance" paragraph of Boeing Alert Requirements Bulletin B787-81205-SB380021-00 RB, Issue 001, dated August 12, 2022, refer to the Issue 001 date of Requirements Bulletin B787-81205-SB380021-00 RB, this AD requires using June 29, 2023 (the effective date of AD 2023-08-04). (i) Retained Credit for Previous Actions, With No Changes This paragraph restates the provisions of paragraph (i) of AD 2023-08-04, with no changes. This paragraph provides credit for the actions specified in paragraph (g) of this AD, if those actions were performed before June 29, 2023 (the effective date of AD 2023-08-04), using Multi Operator Message MOM-MOM-21-0554-01B, dated December 14, 2021 (for lavatory inspections); and MOM-MOM-22-0229-01B, dated April 29, 2022 (for galley inspections). (j) New Required Actions For airplanes identified in Boeing Alert Requirements Bulletin B787-81205-SB250299-00 RB, Issue 002, dated February 28, 2025: Except as specified by paragraph (k) of this AD, at the applicable times specified in the "Compliance" paragraph of Boeing Alert Requirements Bulletin B787-81205-SB250299-00 RB, Issue 002, dated February 28, 2025, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin B787-81205-SB250299-00 RB, Issue 002, dated February 28, 2025. Note 2 to paragraph (j): Guidance for accomplishing the actions required by paragraph (j) of this AD can be found in Boeing Alert Service Bulletin B787-81205-SB250299-00, Issue 002, dated February 28, 2025, which is referred to in Boeing Alert Requirements Bulletin B787-81205-SB250299-00 RB, Issue 002, dated February 28, 2025. (k) New Exception to Service Information Specifications Where the Compliance Time column of the table in the "Compliance" paragraph of Boeing Alert Requirements Bulletin B787-81205-SB250299-00 RB, Issue 002, dated February 28, 2025, uses the phrase "the Issue 001 date of Requirements Bulletin B787-81205-SB250299-00 RB," this AD requires using the effective date of this AD. (l) Terminating Action for Clamshell Coupling Inspection For the airplanes identified in Boeing Alert Requirements Bulletin B787-81205-SB250299-00 RB, Issue 002, dated February 28, 2025: Accomplishment of the actions required by paragraph (j) of this AD terminates the requirements of paragraph (g) of this AD. (m) Parts Installation Prohibition As of the effective date of this AD, no person may install a clamshell coupling, part number (P/N) 14C02-08C (AS1655C08) or P/N 14C02-08A (AS1655A08), at inspection locations where P/N 14C02-08C (AS1655C08) or P/N 14C02-08A (AS1655A08) was replaced with P/N 14C34-08C or P/N 14C33-08 on any airplane. (n) 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 Continued Operational Safety Branch, send it to the attention of the person identified in paragraph (o)(1) of this AD. Information may be emailed to: AMOC@faa.gov. 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. (o) Additional Information (1) For more information about this AD, contact Joshua Baek, Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 562-627-6725; email: joshua.y.baek@faa.gov. (2) Material identified in this AD that is not incorporated by reference is available at the address specified in paragraph (p)(5) of this AD. (p) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference (IBR) 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 this AD specifies otherwise. (3) The following material was approved for IBR on June 3, 2026. (i) Boeing Alert Requirements Bulletin B787-81205-SB250299-00 RB, Issue 002, dated February 28, 2025. (ii) [Reserved] (4) The following material was approved for IBR on June 29, 2023 (88 FR 33823, May 25, 2023). (i) Boeing Alert Requirements Bulletin B787-81205-SB380021-00 RB, Issue 001, dated August 12, 2022. (ii) [Reserved] (5) 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. (6) 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. (7) 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 fr.inspection@nara.gov. Issued on April 21, 2026. Victor Wicklund, Acting Director, Integrated Certificate Management Division, Aircraft Certification Service. [FR Doc. 2026-08306 Filed 4-28-26; 8:45 am]BILLING CODE 4910-13-P