EASA AD US-2026-19-04
Hydraulic Power - Alternating Current Motor Pump - Inspection
Summary
The Federal Aviation Administration (FAA) Airworthiness Directive 2026-19-04 is a final rule addressing all Boeing Model 777-200, -200LR, -300, -300ER, and 777F series airplanes. It targets the alternating current motor pump (ACMP) with part number 731966, which has been linked to an overheated condition causing a fire in the main landing gear wheel well. This directive mandates inspections and prohibits installation of affected ACMP parts to mitigate fire risk.
What Changed
This new airworthiness directive introduces mandatory records checks or inspections for the ACMP with part number 731966 installed on Boeing 777 series airplanes. It requires on-condition corrective actions and prohibits installation of the affected ACMP parts after the effective date. The directive also incorporates a redesigned ACMP with fusible links to prevent overheating due to electrical failures.
Why It Matters
This directive is critical for aviation professionals as it addresses a safety hazard that could lead to fire and damage in the main landing gear wheel well, potentially compromising safe flight and landing. Operators and maintenance teams must ensure compliance to prevent in-service failures and mitigate fire risks. The prohibition on installing affected parts impacts inventory management and maintenance planning.
What To Do
Operators of Boeing 777-200, -200LR, -300, -300ER, and 777F airplanes must perform a records check or inspection for ACMP part number 731966 and carry out any required corrective actions. Installation of ACMP P/N 731966 is prohibited as of November 2, 2026. Any installed affected parts must be replaced within 60 months from the effective date of the directive.
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