Airworthiness Directive · Amendment 39-22237 · Water/waste
The Boeing Company Airplanes
This AD applies to all The Boeing Company Model 777F series airplanes, certificated in any category.
The FAA is superseding Airworthiness Directive (AD) 2021-06- 03, which applied to all The Boeing Company Model 777F series airplanes. AD 2021-06-03 required deactivating the potable water system. 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 retains the actions required by AD 2021-06-03 and requires installing a shroud to the water supply line in the forward cargo compartment, and performing a leak test of the potable water system. For certain airplanes, this AD also requires replacing tubes and hoses from the water supply line and installing a shroud to the water return line. The FAA is issuing this AD to address the unsafe condition on these products.
This paragraph restates the requirements of paragraph (g) of AD 2021-06-03, with no changes. For the airplanes identified in paragraphs (g)(1) and (2) of this AD: Within 5 days after March 5, 2021 (the effective date of AD 2021-06-03), deactivate the potable water system, in accordance with Boeing Multi Operator Message MOM-MOM-21-0089-01B, dated February 26, 2021 (Boeing 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 through L/N 1689 inclusive.
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.
This paragraph restates the requirements of paragraph (h) of AD 2021-06-03, with no changes. For airplanes not identified in paragraph (g) of this AD: As of March 5, 2021 (the effective date of AD 2021-06-03), accomplishment of the actions specified in Boeing Service Bulletin 777-38-0042 is prohibited.
This paragraph restates the requirements of paragraph (i) of AD 2021-06-03, with no changes. Although Boeing MOM-MOM-21-0089-01B specifies to report inspection findings, this AD does not require any report.
Except as specified by paragraph (k) of this AD: At the applicable times specified in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 777-38A0048 RB, dated October 18, 2021, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 777-38A0048 RB, dated October 18, 2021.
Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 777-38A0048, dated October 18, 2021, which is referred to in Boeing Alert Requirements Bulletin 777-38A0048 RB, dated October 18, 2021.
Where the Compliance Time columns of the tables in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 777-38A0048 RB, dated October 18, 2021, use the phrase “the Original Issue date of Requirements Bulletin 777-38A0048 RB,” this AD requires using “the effective date of this AD.”
Accomplishment of the installation of a shroud around the water supply line and gray water line at station (STA) 529 to STA 634 in the forward cargo compartment, and a shroud around the water return line at STA 550 to STA 620 in the forward cargo compartment, as specified in the Accomplishment Instructions of Boeing Alert Service Bulletin 777-38A0047, dated March 30, 2021, terminates the potable water system deactivation required by paragraph (g) of this AD, provided the conditions specified in paragraphs (l)(1) and (2) of this AD are met.
(1) Repetitive inspections and applicable corrective actions are done at the applicable times specified in Table 1 and Table 2 of paragraph 1.E, “Compliance,” of Boeing Alert Service Bulletin 777-38A0047, dated March 30, 2021, and in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 777-38A0047, dated March 30, 2021.
(2) The potable water system is deactivated in accordance with Boeing MOM-MOM-21-0089-01B, within 42 months after March 30, 2021 (the issue date of Boeing Alert Service Bulletin 777-38A0047, dated March 30, 2021).
Accomplishment of the required actions specified in the Accomplishment Instructions of Boeing Alert Requirements Bulletin 777-38A0048 RB, dated October 18, 2021, terminates the potable water system deactivation required by paragraph (g) of this AD.
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
