# Federal Register #FAA-2025-3997

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

**Buyer:** Federal Aviation Administration (FAA), Department of Transportation
**Posted:** September 28, 2026
**Identifier:** FAA-2025-3997
**NAICS:** 811219, 336413

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.

[View original listing](https://www.federalregister.gov/documents/2026/09/28/2026-19751/airworthiness-directives-the-boeing-company-airplanes)