FAA Targets Shaky CFM Engines: Mandatory Checks Ahead
Published Date: 6/25/2025
Proposed Rule
Summary
The FAA wants to make sure certain CFM LEAP engines stay safe after some had trouble during takeoff because of engine vibrations. They’re asking owners to check and inspect parts regularly and replace some if needed to keep flights smooth and safe. These checks and fixes will happen on a schedule, so operators should be ready to act and invest in maintenance to avoid bigger problems.
Analyzed Economic Effects
3 provisions identified: 0 benefits, 3 costs, 0 mixed.
Mandatory NSV Calculations for LEAP
If you operate the listed CFM LEAP engines (LEAP-1A23, -1A24, -1A24E1, -1A26, -1A26CJ, -1A26E1, -1A29, -1A29CJ, -1A30, -1A32, -1A33, -1A33B2, and -1A35A), the FAA would require initial and repetitive calculations of non-synchronous vibration (NSV) levels. You must perform these calculations on a schedule to check for high NSV that can cause high-pressure compressor stalls.
HPT Honeycomb Inspections Required
The FAA would require inspection of the stage 2 high-pressure turbine (HPT) nozzle assembly honeycomb and the HPT stator stationary seal honeycomb on the listed LEAP engines. Depending on inspection results, you must replace certain parts identified by the AD.
No. 3 Bearing Housing Replacement Mandate
The FAA would require replacement of certain No. 3 bearing spring finger housings on the listed LEAP engines at a specified time under the proposed AD. This is to address wear that can lead to high non-synchronous vibration (NSV).
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