Airworthiness directives › 2026-22-04
AD 2026-22-04 Airworthiness Directives; The Boeing Company Airplanes
Models named: 747-400, -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 and -8 series airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletin 747-28A2373 RB, dated November 6, 2025.
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 747-28A2373 RB, dated November 6, 2025, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 747-28A2373 RB, dated November 6, 2025. Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 747-28A2373, dated November 6, 2025, which is referred to in Boeing Alert Requirements Bulletin 747-28A2373 RB, dated November 6, 2025.
Unsafe condition
This AD was prompted by reports of wear-through of the transfer pump motor impeller inlet adapter of the horizontal stabilizer fuel tank transfer pump caused by contact between the transfer pump housing inlet check valve and the inlet adapter. The FAA is issuing this AD to address the development of an ignition source within the horizontal stabilizer fuel tank resulting from wear to the transfer pump housing inlet check valves and transfer pump motor impeller inlet adapters of the horizontal stabilizer fuel tank. The unsafe condition, if not addressed, could, in combination with flammable fuel vapors, result in a fuel tank explosion and consequent loss of the airplane.
Affected ADs
This AD replaces AD 2023-07-09, Amendment 39-22411 (88 FR 22895, April 14, 2023) (AD 2023-07-09).
Read the original on the Federal Register →
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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