FAA Mandates Boeing 737 Engine Cover Fixes to Prevent Fly-Aways
Published Date: 3/4/2025
Rule
Summary
If you own or fly certain Boeing 737 models, this new rule means you need to fix or check parts on the engine’s inlet cowl to keep flights safe. The FAA wants these changes done soon to prevent engine parts from falling off and causing emergencies. Some fixes might cost money, but they’re worth it to keep everyone safe and sound in the sky.
Analyzed Economic Effects
5 provisions identified: 0 benefits, 4 costs, 1 mixed.
Which Boeing 737s Are Covered
This rule applies to all Boeing 737-600, -700, -700C, -800, -900, and -900ER series airplanes. If you operate or maintain any of these models, the AD sets required inspections and repairs you must follow.
Replace Inlet Cowl Aft Fasteners
For certain airplanes covered by the AD, you must replace specified inlet cowl aft bulkhead fasteners. The replacement is required by the AD to address separation risks after engine fan blade-out events.
Inspect And Replace Riveted Fasteners
For other specified airplanes, the AD requires inspecting the inlet cowl aft bulkhead fastener and replacing the fasteners if rivets are found. Finding rivets will trigger required replacement work.
Replace Crushable Spacers Or Install Cowl
For all airplanes covered by the AD, you must replace the crushable spacers used to attach the inlet cowl to the engine fan case, or as an option you may install a serviceable inlet cowl. This action is required to prevent inlet cowl or fan cowl separation after engine events.
Update Maintenance Programs With AWLs
The AD also requires revising existing maintenance or inspection programs to incorporate new airworthiness limitations (AWLs). Operators must update their program documents as applicable to comply with the AD.
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