# Proposed AD FAA-2023-0653: CFM International, S.A. Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2023-09-06
- Products: CFM International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 24, 2023, 88 FR 17753
- Comments due: April 24, 2023
- Became: [AD 2023-09-06](https://openairdocs.org/ad/2023-09-06)
- Docket: FAA-2023-0653 (https://www.regulations.gov/docket/FAA-2023-0653, where comments are filed)
- Project: AD-2023-00280-E
- FR document: 2023-05862
- Official PDF: https://openairdocs.org/files/sha256/cd/18/cd18629023ca43b8afa87c8f3099cb0c4b0ba140b74524cb694d1a55cbe6bc58 (from https://www.govinfo.gov/content/pkg/FR-2023-03-24/pdf/2023-05862.pdf)
- Federal Register: https://www.federalregister.gov/documents/2023/03/24/2023-05862/airworthiness-directives-cfm-international-sa-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2023-05862-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2023-0653

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all CFM International, S.A. (CFM) LEAP-1A23, LEAP-1A24, LEAP- 1A24E1, LEAP-1A26, LEAP-1A26CJ, LEAP-1A26E1, LEAP-1A29, LEAP-1A29CJ, LEAP-1A30, LEAP-1A32, LEAP-1A33, LEAP-1A33B2, and LEAP-1A35A (LEAP-1A) model turbofan 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), forward outer seals, and stages 6-10 compressor rotor spools 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, forward outer seals, and stages 6-10 compressor rotor spools. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Mar 24, 2023: Notice of proposed rulemaking (NPRM). (first notice), FR document 2023-05862, comments due Apr 24, 2023 (https://www.federalregister.gov/documents/2023/03/24/2023-05862/airworthiness-directives-cfm-international-sa-turbofan-engines)

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