# Proposed AD FAA-2023-1216: CFM International, S.A. Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2023-23-12
- Products: CFM International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 24, 2023, 88 FR 47404
- Comments due: September 7, 2023
- Became: [AD 2023-23-12](https://openairdocs.org/ad/2023-23-12)
- Docket: FAA-2023-1216 (https://www.regulations.gov/docket/FAA-2023-1216, where comments are filed)
- Project: AD-2023-00502-E
- FR document: 2023-15378
- Official PDF: https://openairdocs.org/files/sha256/04/8d/048dc31c8589d26d62c6b2efeb8a497ac5377af5f37a3c11a445954b98670bdd (from https://www.govinfo.gov/content/pkg/FR-2023-07-24/pdf/2023-15378.pdf)
- Federal Register: https://www.federalregister.gov/documents/2023/07/24/2023-15378/airworthiness-directives-cfm-international-sa-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2023-15378-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2023-1216

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for 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. This proposed AD was prompted by a manufacturer investigation that revealed that certain high-pressure turbine (HPT) rotor stage 1 disks (HPT stage 1 disks) and a certain compressor rotor stages 6-10 spool were manufactured from material suspected to have reduced material properties due to iron inclusion. This proposed AD would require replacement of certain HPT stage 1 disks and a certain compressor rotor stages 6-10 spool. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jul 24, 2023: Notice of proposed rulemaking (NPRM). (first notice), FR document 2023-15378, comments due Sep 7, 2023 (https://www.federalregister.gov/documents/2023/07/24/2023-15378/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.