# Proposed AD FAA-2016-9592: CFM International S.A. Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2017-14-08
- Products: CFM International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 9, 2017, 82 FR 13077
- Comments due: April 24, 2017
- Became: [AD 2017-14-08](https://openairdocs.org/ad/2017-14-08)
- Docket: FAA-2016-9592 (https://www.regulations.gov/docket/FAA-2016-9592, where comments are filed)
- Project: 2016-NE-30-AD
- FR document: 2017-04523
- Official PDF: https://openairdocs.org/files/sha256/38/20/382081ffa3739ecf93e5c50873f8d324e5e0c6f7c3852882e05b54553de88eb3 (from https://www.govinfo.gov/content/pkg/FR-2017-03-09/pdf/2017-04523.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/03/09/2017-04523/airworthiness-directives-cfm-international-sa-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/308BEEFD178CD99F862580DE005C6442.0001
- Page: https://openairdocs.org/proposed/FAA-2016-9592

## Summary

We propose to adopt a new airworthiness directive (AD) for certain CFM International S.A. (CFM) CFM56-3, -3B, and -3C turbofan engines. This proposed AD was prompted by a report of dual-engine loss of thrust control that resulted in an air turn back. This proposed AD would require initial and repetitive checks of the variable stator vane (VSV) actuation system in the high-pressure compressor (HPC). We are proposing this AD to correct the unsafe condition on these products.

## Notices in this docket

- Mar 9, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2017-04523, comments due Apr 24, 2017 (https://www.federalregister.gov/documents/2017/03/09/2017-04523/airworthiness-directives-cfm-international-sa-turbofan-engines)

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