# Proposed AD FAA-2010-0026: CFM International, S.A. CFM56-5, -5B, and -7B Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-13-09
- Products: CFM International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 18, 2010, 75 FR 13045
- Comments due: May 17, 2010
- Became: [AD 2010-13-09](https://openairdocs.org/ad/2010-13-09)
- Docket: FAA-2010-0026 (https://www.regulations.gov/docket/FAA-2010-0026, where comments are filed)
- Project: 2010-NE-03-AD
- FR document: 2010-5861
- Official PDF: https://openairdocs.org/files/sha256/e3/9d/e39d406980a84e7fcf9d27351ad63d298d11ea2b7236428dd7c6fe5ca18aecaf (from https://www.govinfo.gov/content/pkg/FR-2010-03-18/pdf/2010-5861.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/03/18/2010-5861/airworthiness-directives-cfm-international-sa-cfm56-5--5b-and--7b-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DDAF86BE6D4FBEFD86257715005ADBF9.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0026

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for CFM International, S.A. CFM56-5, -5B, and -7B series turbofan engines. This proposed AD would require removing from service, nine stage 3 low-pressure turbine (LPT) disks, identified by serial number (S/N). This proposed AD results from the discovery of a material nonconformity requiring removal of the disk before the certified disk life of certain stage 3 LPT disks. We are proposing this AD to prevent uncontained failure of the stage 3 LPT disk and damage to the airplane.

## Notices in this docket

- Mar 18, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-5861, comments due May 17, 2010 (https://www.federalregister.gov/documents/2010/03/18/2010-5861/airworthiness-directives-cfm-international-sa-cfm56-5--5b-and--7b-series-turbofan-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.