EASA AD US-2022-27-07: Superseded by FAA AD 2023-07-09

What to do

Operators of affected Boeing 747-400 and 747-8 series airplanes must perform the required inspections of the motor impeller inlet adapters and inlet check valves by January 13, 2023. Any worn parts identified must be replaced with serviceable components, and inspection results should be reported to Boeing. Comments on the directive are accepted until February 13, 2023.

Summary

FAA Airworthiness Directive 2022-27-07 is a final rule addressing certain Boeing 747-400 and 747-8 series airplanes. It requires inspections and corrective actions for wear on the motor impeller inlet adapters and inlet check valves of the horizontal stabilizer fuel tank transfer pumps to prevent potential fuel tank ignition sources. This directive aims to mitigate the risk of fuel tank explosions caused by wear-induced steel-on-steel contact within the pump assembly.

What changed

This new airworthiness directive introduces mandatory one-time detailed visual inspections for wear on specific transfer pump components and limits the installation of affected parts. It also requires reporting inspection results to Boeing and mandates replacement of worn parts as necessary. The directive is issued as an interim measure pending further investigation and potential future rulemaking.

Why it matters

This directive is critical for aviation professionals because undetected wear in the transfer pump assembly can create ignition sources inside the fuel tank, posing a severe safety risk. Operators and maintenance teams must address this issue promptly to ensure continued airworthiness and prevent catastrophic fuel tank explosions. Compliance ensures regulatory adherence and enhances flight safety for affected Boeing 747 models.

What to do

Summary

What changed

Why it matters

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