# Proposed AD FAA-2021-1183: CFM International, S.A. Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2022-09-09
- Products: CFM International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 18, 2022, 87 FR 2563
- Comments due: March 4, 2022
- Became: [AD 2022-09-09](https://openairdocs.org/ad/2022-09-09)
- Docket: FAA-2021-1183 (https://www.regulations.gov/docket/FAA-2021-1183, where comments are filed)
- Project: AD-2021-01193-E
- FR document: 2022-00509
- Official PDF: https://openairdocs.org/files/sha256/26/70/2670a89ea037246685df43aea5294314e4861836438cb3f5150f5a8f2a935de6 (from https://www.govinfo.gov/content/pkg/FR-2022-01-18/pdf/2022-00509.pdf)
- Federal Register: https://www.federalregister.gov/documents/2022/01/18/2022-00509/airworthiness-directives-cfm-international-sa-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2022-00509-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2021-1183

## 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 model turbofan engines. This proposed AD was prompted by the detection of melt-related freckles in the billet, which may reduce the life of certain compressor rotor stages 6-10 spools, high pressure turbine (HPT) rotor interstage seals, HPT rotor stage 2 disks, low pressure turbine (LPT) stage 1 disks, LPT stage 2 disks, LPT stage 3 disks, and LPT stage 4 disks. This proposed AD would require revising the airworthiness limitations section (ALS) of the applicable CFM LEAP-1A Engine Shop Manual (ESM) and the operator's existing approved continuous airworthiness maintenance program (CAMP) to incorporate reduced life limits for these parts. This proposed AD would also require the removal of certain LPT stage 4 disks identified by serial number (S/N) prior to their new life limits. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jan 18, 2022: Notice of proposed rulemaking (NPRM). (first notice), FR document 2022-00509, comments due Mar 4, 2022 (https://www.federalregister.gov/documents/2022/01/18/2022-00509/airworthiness-directives-cfm-international-sa-turbofan-engines)

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