# Proposed AD FAA-2019-0568: CFM International S.A. Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-10-09
- Products: CFM International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 20, 2019, 84 FR 49487
- Comments due: November 4, 2019
- Became: [AD 2021-10-09](https://openairdocs.org/ad/2021-10-09)
- Docket: FAA-2019-0568 (https://www.regulations.gov/docket/FAA-2019-0568, where comments are filed)
- FR document: 2019-20054
- Official PDF: https://openairdocs.org/files/sha256/14/8d/148d0b67da709d82d86c02961d6b05a66bbb2ac64bec8b04ed994922d3a7646e (from https://www.govinfo.gov/content/pkg/FR-2019-09-20/pdf/2019-20054.pdf)
- Federal Register: https://www.federalregister.gov/documents/2019/09/20/2019-20054/airworthiness-directives-cfm-international-sa-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/85398852966305378625847B0043DA2E.0001
- Page: https://openairdocs.org/proposed/FAA-2019-0568

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all CFM International, S.A. (CFM) CFM56-5B and CFM56-7B model turbofan engines with a certain high-pressure turbine (HPT) inner stationary seal installed. This proposed AD was prompted by cracks found in the rotating air HPT front seal. This proposed AD would require removal, inspection, and replacement of the affected HPT inner stationary seal, and depending on the findings, removal and replacement of the rotating air HPT front seal. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Sep 20, 2019: Notice of proposed rulemaking (NPRM). (first notice), FR document 2019-20054, comments due Nov 4, 2019 (https://www.federalregister.gov/documents/2019/09/20/2019-20054/airworthiness-directives-cfm-international-sa-turbofan-engines)

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