Boeing 757s Have Valves That Just Won't Open Sometimes
Published Date: 1/10/2025
Rule
Summary
The FAA is making sure certain Boeing 757 airplanes stay safe by fixing a problem with a part that controls power flow. Starting February 14, 2025, airlines must install new relays and update wiring to prevent the power control valve from getting stuck. This update helps avoid potential safety issues and keeps flights running smoothly, with some costs for the fixes but big peace of mind.
Analyzed Economic Effects
4 provisions identified: 3 benefits, 1 costs, 0 mixed.
Reduced Risk of Takeoff Performance Failure
The AD addresses reports of PTU control valves failing to open when commanded; fixing relays and wiring reduces the risk that, together with loss of the left engine or engine-driven pump (EDP) during takeoff, the landing gear would not retract in a timely manner and could affect climb performance. The FAA issued this AD to prevent added drag, degraded climb gradient, and potential inability to clear obstacles on takeoff.
Mandatory PTU Relay and Wiring Fix
Starting February 14, 2025, operators of certain Boeing 757-200, -200PF, -200CB, and -300 airplanes identified in Boeing Alert Requirements Bulletin 757-29A0071 RB (dated November 16, 2023) must install new relays and change wire bundles to the power transfer unit (PTU) control valve. The FAA estimates the work takes 45 labor hours at $85/hour plus $3,260 in parts (total $7,085 per airplane) and affects 467 U.S.-registered airplanes (aggregate U.S. cost $3,308,695). The compliance time is 30 months or 2,760 flight hours after the AD effective date, whichever occurs first.
Allowed Connector Position Flexibility
The AD allows installers to use any open position on the P33 panel or disconnect bracket AD0880 or AD0881 for installing the new connectors instead of the specific positions shown in the Boeing requirements bulletin. The operational test specified in the AD remains required to verify system functionality.
AMOC and Compliance-Time Extension Option
Operators may request FAA approval of alternative methods of compliance (AMOCs) under 14 CFR 39.19, and the FAA will consider requests to extend the compliance time if operators submit sufficient substantiating data. AMOCs must be approved by the Manager, AIR-520, Continued Operational Safety Branch, FAA.
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