FAA Mandates Engine Part Swaps for Safety Concerns
Published Date: 7/21/2025
Rule
Summary
If you own or operate certain CFM LEAP-1B engines, this new rule means you need to replace some turbine and compressor parts made from questionable metal. The FAA found more parts that might be risky, so they’re expanding the list and keeping the replacement rules in place. Act quickly to keep your engines safe and avoid costly problems down the road!
Analyzed Economic Effects
2 provisions identified: 0 benefits, 2 costs, 0 mixed.
Required replacement of LEAP-1B turbine and spool
If you own or operate certain CFM LEAP-1B engines (models LEAP-1B21, -1B23, -1B25, -1B27, -1B28, -1B28B1, -1B28B2, -1B28B2C, -1B28B3, -1B28BBJ1, and -1B28BBJ2), this rule keeps the requirement to replace certain high-pressure turbine (HPT) rotor stage 1 disks and a compressor rotor stages 6-10 spool. The Airworthiness Directive requires those parts to be replaced to address an unsafe condition caused by suspect material.
Expanded applicability to additional suspect disks
The rule expands the list of affected HPT rotor stage 1 disks to include additional parts made from material suspected to have reduced properties due to iron inclusion. If your engines contain those additional affected disks, they are now covered by the AD and must be addressed under the replacement requirements.
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