Airworthiness Directive · Amendment 39-22958 · Water/waste
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 747-400, 747-400F, 747-8F, and 747-8 series airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletin 747-38A2146 RB, dated August 7, 2024.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-400, 747-400F, 747-8F, and 747-8 series airplanes. This AD was prompted by a report that, during potable water servicing, there were multiple engine indicating and crew alerting system messages. The cause was the separation of a fitting and steel water supply tube above an electronics equipment cooling air filter, behind the forward cargo compartment left sidewall. This AD requires, depending on configuration, installing at certain locations: conduits on exposed potable water supply lines, envelope assemblies over all exposed potable water line fittings and exposed potable water supply lines, a slitted spray shield, a two-piece deflector shield around the equipment cooling system (ECS) air inlet, and/or a shroud on exposed potable water supply lines. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified by paragraph (h) of this AD: At the applicable times specified in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 747-38A2146 RB, dated August 7, 2024, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 747-38A2146 RB, dated August 7, 2024.
Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 747-38A2146, dated August 7, 2024, which is referred to in Boeing Alert Requirements Bulletin 747-38A2146 RB, dated August 7, 2024.
Where the Compliance Time columns of the tables in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 747-38A2146 RB, dated August 7, 2024, refer to the original issue date of Requirements Bulletin 747-38A2146 RB, this AD requires using the effective date 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
