Airworthiness directives › 2025-03-10
AD 2025-03-10 Airworthiness Directives; The Boeing Company Airplanes
Models named: 747-400, 747-400F, 747-8F, 747-8 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
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 747-38A2146 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.
Unsafe condition
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. The FAA is issuing this AD to address water leaks into the main electronics center. The unsafe condition, if not addressed, could result in an adverse impact on the function of multiple electronics and line replaceable units (LRUs) in the equipment bay racks that are essential for safe flight, which can lead to the loss of continued safe flight and landing.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1