Boeing 777 landing gear pumps risk overheating into inferno—FAA steps in.
Published Date: 9/28/2026
Rule
Summary
If you own or operate Boeing 777 airplanes, listen up! The FAA found a fire risk from a motor pump that can overheat in the landing gear area. Starting November 2, 2026, you’ll need to check records or inspect these pumps, fix any problems, and stop installing the risky parts to keep flights safe and sound.
Analyzed Economic Effects
5 provisions identified: 1 benefits, 4 costs, 0 mixed.
Ban on installing affected pump part
As of November 2, 2026, no person may install an alternating current motor pump (ACMP) having part number 731966 on any airplane. That means even in a maintenance emergency you may not install P/N 731966 on an airplane after that date.
Replacement parts and on-condition fixes required
If an inspection or records check identifies ACMP P/N 731966 that requires action, you must replace it with ACMP P/N 3033115-100 or a later FAA-approved part. The AD also specifies that part numbers 66133-06 or 66068-08 are acceptable replacement parts for this AD.
Estimated affected U.S. fleet and per-aircraft cost
The FAA estimates this AD affects 334 U.S.-registered Boeing 777 airplanes and that 290 of those will require the inspection/records review. The inspection cost is estimated at $170 per airplane, and replacement (if required) is estimated up to $77,099 per airplane; the FAA notes an operator could incur up to $77,269 per airplane if replacement is required.
Required inspections and records check
If you operate a Boeing 777-200, -200LR, -300, -300ER, or 777F airplane, you must perform a records check or inspection per Boeing Alert Requirements Bulletin 777-29A0047 RB, dated September 11, 2025, starting as required by that bulletin and using November 2, 2026 as the AD effective date. The AD requires doing any applicable on-condition actions specified in that Boeing requirements bulletin.
Manufacturer warranty may reduce costs
The FAA notes that, according to the manufacturer, some or all costs of the AD (inspection and replacement) may be covered under warranty, which could reduce the cost impact on affected operators.
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