Boeing 757 Pilots: Hunt for Hidden Heat Damage Now
Published Date: 4/1/2025
Proposed Rule
Summary
The FAA wants Boeing 757 planes checked because some parts that cool the engines are wearing out and might not detect overheating. Owners will need to inspect, test, and possibly replace these parts to keep flights safe. These fixes could cost time and money but are important to avoid bigger problems down the road.
Analyzed Economic Effects
2 provisions identified: 1 benefits, 1 costs, 0 mixed.
Owners must inspect and replace precoolers
The FAA proposes an airworthiness directive for certain Boeing Model 757 airplanes that would require owners to inspect engine strut structure for heat damage, perform repetitive tests of thermal switch temperature and ground wires, and replace the precooler on Model 757-300 airplanes when required. These actions are required to address precoolers that failed from wear-out combined with latent overheat-detection switch failures.
Directive aims to prevent engine overheating
The proposed AD is intended to address an unsafe condition where worn precoolers and failed thermal switches could miss engine overheating. By requiring inspections, repetitive thermal-switch tests, and precooler replacement on Model 757-300 airplanes, the rule is meant to keep flights safer for passengers and crews.
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