Federal Register #FAA-2025-3997

FAA Airworthiness Directives for Boeing 777 AC Motor Pump Replacement and Related Aircraft Safety Actions

This opportunity centers on new airworthiness directives issued by the Federal Aviation Administration (FAA) for multiple aircraft and engine types, with a primary focus on Boeing 777 series airplanes: - Government Buyer: - Federal Aviation Administration (FAA), Department of Transportation - OEMs and Vendors: - The Boeing Company (Boeing 777 series airplanes) - Airbus Helicopters (EC 130 T2 main rotor blades) - Safran Helicopter Engines (Arrius 2B2 engines) - Products/Services Requested: - Inspection and replacement of alternating current motor pumps (ACMP) with part number 731966 on Boeing 777 series airplanes - 334 units affected - Replacement with P/N 3033115-100 or approved alternatives (66133-06 or 66068-08) - Inspection of main rotor blades delivered before September 23, 2024, for Airbus EC 130 T2 helicopters - Maintenance program updates for Safran Arrius 2B2 engines, including new life limits and maintenance tasks - Unique/Notable Requirements: - Prohibition of installation of affected ACMPs on Boeing 777s - Compliance required within 60 months after directive effective date - Safety-driven requirements to prevent fire and engine failure risks - Direct reference to specific part numbers and approved alternatives - Maintenance manual updates for Safran engines - Technical information is accessible, focusing on safety-critical inspections, replacements, and maintenance updates for major OEM aircraft and engines.

Description

The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 777-200, -200LR, -300, -300ER, and 777F series airplanes. This AD was prompted by a report of an overheated alternating current motor pump (ACMP) that caused a fire in the main landing gear wheel well. It requires a records check or inspection for any installed ACMP with a certain part number and applicable on-condition actions, and prohibits the installation of affected parts. The AD aims to address the unsafe condition and prevent fires caused by overheated ACMPs on these aircraft models.

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