# Proposed AD FAA-2024-1898: CFM International, S.A. Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2024-25-02
- Products: CFM International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 29, 2024, 89 FR 60838
- Comments due: September 12, 2024
- Became: [AD 2024-25-02](https://openairdocs.org/ad/2024-25-02)
- Docket: FAA-2024-1898 (https://www.regulations.gov/docket/FAA-2024-1898, where comments are filed)
- Project: AD-2023-01013-E
- FR document: 2024-16473
- Official PDF: https://openairdocs.org/files/sha256/43/8f/438fdc3d240f217105709cd2777d7d024fef3a0e948dd4696b1d7da73522e6cf (from https://www.govinfo.gov/content/pkg/FR-2024-07-29/pdf/2024-16473.pdf)
- Federal Register: https://www.federalregister.gov/documents/2024/07/29/2024-16473/airworthiness-directives-cfm-international-sa-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2024-16473-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2024-1898

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain CFM International, S.A. (CFM) Model LEAP-1B engines. This proposed AD was prompted by a report of a quality escape involving certain high-pressure compressor (HPC) stage 2 seals manufactured without detailed finish machining, which could result in deeper rubs and mechanical damage to the seal teeth of the stage 3-4 compressor rotor blisk (stage 3-4 blisk) of the mating compressor rotor during initial operation. This proposed AD would require a visual inspection of the HPC stage 2 seal, a visual inspection of the forward arm seal teeth of the stage 3-4 blisk, an eddy current inspection (ECI) of the forward arm seal teeth of the stage 3-4 blisk, and replacement of the HPC stage 2 seal and the stage 3-4 blisk, if necessary. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jul 29, 2024: Notice of proposed rulemaking (NPRM). (first notice), FR document 2024-16473, comments due Sep 12, 2024 (https://www.federalregister.gov/documents/2024/07/29/2024-16473/airworthiness-directives-cfm-international-sa-engines)

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