# Proposed AD FAA-2025-0621: CFM International, S.A. Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2025-14-08
- Products: CFM International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 15, 2025, 90 FR 15670
- Comments due: May 30, 2025
- Became: [AD 2025-14-08](https://openairdocs.org/ad/2025-14-08)
- Docket: FAA-2025-0621 (https://www.regulations.gov/docket/FAA-2025-0621, where comments are filed)
- Project: AD-2024-00796-E
- FR document: 2025-06382
- Official PDF: https://openairdocs.org/files/sha256/63/5f/635f1d46f0632e9fcd5dbb83cfbb79aae782d36dd0843a6eb3991bed8235cf45 (from https://www.govinfo.gov/content/pkg/FR-2025-04-15/pdf/2025-06382.pdf)
- Federal Register: https://www.federalregister.gov/documents/2025/04/15/2025-06382/airworthiness-directives-cfm-international-sa-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2025-06382-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2025-0621

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2023-23-12, which applies to all CFM International, S.A. (CFM) Model LEAP-1B21, LEAP-1B23, LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-1B28B1, LEAP-1B28B2, LEAP-1B28B2C, LEAP-1B28B3, LEAP-1B28BBJ1, and LEAP- 1B28BBJ2 (LEAP-1B) engines. AD 2023-23-12 requires replacing certain high-pressure turbine (HPT) rotor stage 1 disks and a certain compressor rotor stages 6-10 spool. Since the FAA issued AD 2023-23-12, the manufacturer has identified additional parts that were manufactured from material suspected to have reduced material properties due to iron inclusion, which prompted this proposed AD. This proposed AD would retain the requirements to replace certain HPT rotor stage 1 disks and a certain compressor rotor stages 6-10 spool. This proposed AD would also expand the applicability to include additional affected HPT rotor stage 1 disks that were manufactured from the same material suspected to have reduced material properties due to iron inclusion. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Apr 15, 2025: Notice of proposed rulemaking (NPRM). (first notice), FR document 2025-06382, comments due May 30, 2025 (https://www.federalregister.gov/documents/2025/04/15/2025-06382/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.