# Proposed AD FAA-2024-2424: CFM International, S.A. Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2025-04-12
- Products: CFM International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 8, 2024, 89 FR 88681
- Comments due: December 23, 2024
- Became: [AD 2025-04-12](https://openairdocs.org/ad/2025-04-12)
- Docket: FAA-2024-2424 (https://www.regulations.gov/docket/FAA-2024-2424, where comments are filed)
- Project: AD-2024-00416-E
- FR document: 2024-25869
- Official PDF: https://openairdocs.org/files/sha256/52/15/521536c31d6660efa1585727679ab732c59998c5ec445d0a0ca42ef747c35698 (from https://www.govinfo.gov/content/pkg/FR-2024-11-08/pdf/2024-25869.pdf)
- Federal Register: https://www.federalregister.gov/documents/2024/11/08/2024-25869/airworthiness-directives-cfm-international-sa-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2024-25869-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2024-2424

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain CFM International, S.A. (CFM) Model LEAP-1A, LEAP-1B, and LEAP-1C engines. This proposed AD was prompted by a manufacturer investigation that revealed a quality escape for low-pressure turbine (LPT) disks made from forgings with nonconforming grain size. This proposed AD would require removal and replacement of the LPT stage 4 and stage 5 disks. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Nov 8, 2024: Notice of proposed rulemaking (NPRM). (first notice), FR document 2024-25869, comments due Dec 23, 2024 (https://www.federalregister.gov/documents/2024/11/08/2024-25869/airworthiness-directives-cfm-international-sa-engines)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.