Airworthiness Directive · Amendment 39-21469 · Water/waste
The Boeing Company Airplanes
Superseded. A later AD replaced this one: AD 2022-23-10. Comply with the one in force.
This AD applies to all The Boeing Company Model 777F series airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 777F series airplanes. This AD was prompted by a report of a water supply line that detached at a certain joint located above an electronic equipment (EE) cooling filter, leading to water intrusion into the forward EE bay. This AD requires deactivating the potable water system. The FAA is issuing this AD to address the unsafe condition on these products.
For the airplanes identified in paragraphs (g)(1) and (2) of this AD: Within 5 days after the effective date of this AD, deactivate the potable water system, in accordance with Boeing Multi Operator Message MOM-MOM-21-0089-01B, dated February 26, 2021 (MOM-MOM-21-0089-01B).
(1) Line numbers (L/Ns) 959 and earlier on which the actions specified in Boeing Service Bulletin 777-38-0042 have been accomplished.
(2) L/Ns 960 and subsequent.
Note 1 to paragraph (g): Guidance on deactivating the potable water system can be found in Boeing 777 Aircraft Maintenance Manual (AMM) Task 38-10-00-040-801.
For airplanes not identified in paragraph (g) of this AD: As of the effective date of this AD, accomplishment of the actions specified in Boeing Service Bulletin 777-38-0042 is prohibited.
Although Boeing MOM-MOM-21-0089-01B specifies to report inspection findings, this AD does not require any report.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
