# Proposed AD FAA-2024-2325: CFM International, S.A. Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2025-01-03
- Products: CFM International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 2, 2024, 89 FR 80155
- Comments due: November 18, 2024
- Became: [AD 2025-01-03](https://openairdocs.org/ad/2025-01-03)
- Docket: FAA-2024-2325 (https://www.regulations.gov/docket/FAA-2024-2325, where comments are filed)
- Project: AD-2024-00412-E
- FR document: 2024-22600
- Official PDF: https://openairdocs.org/files/sha256/87/49/87497fc02be02bf45663b0b5ea3824d61d26f727e89ecccade077d45ca5b34ed (from https://www.govinfo.gov/content/pkg/FR-2024-10-02/pdf/2024-22600.pdf)
- Federal Register: https://www.federalregister.gov/documents/2024/10/02/2024-22600/airworthiness-directives-cfm-international-sa-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2024-22600-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2024-2325

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain CFM International, S.A. (CFM) Model LEAP-1A and LEAP-1C engines. This proposed AD was prompted by an investigation of an in- flight shut down event that determined the aft arm of the high-pressure turbine (HPT) rotor interstage seal had failed. This proposed AD would require removal from service and replacement of the HPT rotor interstage seal for LEAP-1A engines. Since the HPT rotor interstage seal part number is interchangeable between LEAP-1A and LEAP-1C, this proposed AD will also prohibit installation of these affected parts onto any LEAP-1A or LEAP-1C engine. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Oct 2, 2024: Notice of proposed rulemaking (NPRM). (first notice), FR document 2024-22600, comments due Nov 18, 2024 (https://www.federalregister.gov/documents/2024/10/02/2024-22600/airworthiness-directives-cfm-international-sa-engines)

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