Airworthiness Directives; CFM International, S.A. Engines
Published Date: 1/8/2025
Rule
Summary
The FAA is making new rules for certain CFM LEAP-1B jet engines because some parts weren’t finished right, which could cause damage during early use. Engine owners must inspect specific seals and parts and replace them if needed to keep flights safe. These checks start February 12, 2025, and could cost some money but will stop bigger problems down the line.
Analyzed Economic Effects
2 provisions identified: 0 benefits, 2 costs, 0 mixed.
Mandatory inspections and possible replacements
If you own or operate one of the listed CFM LEAP-1B engines, you must do a visual inspection of the HPC stage 2 seal, a visual inspection of the forward arm seal teeth of the stage 3-4 blisk, and an eddy current inspection (ECI) of those teeth. Do these actions before the engine reaches 2,900 cycles since new (CSN) or within 10 flight cycles after February 12, 2025, whichever occurs later; remove and replace the seal or blisk before further flight if they fail serviceability checks.
FAA estimated inspection and replacement costs
The FAA estimates this AD affects 31 engines on U.S.-registered airplanes. Estimated labor costs are $85 per work-hour: each visual inspection is 1 hour ($85) and the ECI is 4 hours ($340). If replacements are needed, the FAA estimates parts costs of $55,312 (replace HPC stage 2 seal; total cost per product $55,992 including labor) or $518,500 (replace stage 3-4 blisk; total cost per product $519,180 including labor).
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