Airworthiness directives › 2023-07-09
AD 2023-07-09 Airworthiness Directives; The Boeing Company Airplanes
Models named: 747-400, 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 and 747-8 series airplanes, certificated in any category, equipped with an activated horizontal stabilizer fuel tank with Crane Aerospace Hydro-Aire horizontal stabilizer fuel transfer pump housings and transfer pump motor impellers.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
This paragraph restates the definitions specified in paragraphs (g)(1) and (2) of AD 2022-27-07, with a revised definition. (1) A “serviceable” transfer pump motor impeller inlet adapter is an inlet adapter of the motor impeller assembly for which any missing material does not exceed 0.20 inch in the pump axial direction. (2) A “serviceable” transfer pump housing inlet check valve is an inlet check valve for which the hinge pin protrudes past the flapper arm on both sides and there is no metal disk gouging, missing material, corrosion, burrs, or raised material. Minor surface scratches, defects, or appearances of surface wear are acceptable. (3) A horizontal stabilizer tank is considered to be “activated” if it is not deactivated in production or deactivated by an approved alteration.
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. This condition, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.
Affected ADs
This AD replaces AD 2022-27-07, Amendment 39-22292 (87 FR 80028, December 29, 2022) (AD 2022-27-07).
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