# Proposed AD FAA-2015-2983: CFM International S.A. Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-02-04
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 2, 2015, 80 FR 59672
- Comments due: December 1, 2015
- Became: [AD 2016-02-04](https://openairdocs.org/ad/2016-02-04)
- Docket: FAA-2015-2983 (https://www.regulations.gov/docket/FAA-2015-2983, where comments are filed)
- Project: 2015-NE-20-AD
- FR document: 2015-24729
- Official PDF: https://openairdocs.org/files/sha256/70/10/701020cdf191e57b4e42f3c39b2272e3ccbd70c2c3481e691e51277d7a84808c (from https://www.govinfo.gov/content/pkg/FR-2015-10-02/pdf/2015-24729.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/10/02/2015-24729/airworthiness-directives-cfm-international-sa-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/720410AD62865B1A86257ED2004A7373.0001
- Page: https://openairdocs.org/proposed/FAA-2015-2983

## Summary

We propose to adopt a new airworthiness directive (AD) for certain CFM International S.A. (CFM) CFM56-5B series turbofan engines. This proposed AD was prompted by a corrected lifing analysis by the engine manufacturer that shows the need to identify an initial and repetitive inspection threshold for certain part number (P/N) turbine rear frames (TRFs). This proposed AD would require initial and repetitive inspections of certain P/N TRFs on the low-pressure turbine (LPT) frame assembly. We are proposing this AD to prevent failure of the TRF on the LPT frame assembly, which could lead to engine separation, damage to the engine, and damage to the airplane.

## Notices in this docket

- Oct 2, 2015: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-24729, comments due Dec 1, 2015 (https://www.federalregister.gov/documents/2015/10/02/2015-24729/airworthiness-directives-cfm-international-sa-turbofan-engines)

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