# Proposed AD FAA-2016-9128: CFM International S.A. Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2017-05-09
- Products: CFM International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 1, 2016, 81 FR 75761
- Comments due: December 16, 2016
- Became: [AD 2017-05-09](https://openairdocs.org/ad/2017-05-09)
- Docket: FAA-2016-9128 (https://www.regulations.gov/docket/FAA-2016-9128, where comments are filed)
- Project: 2016-NE-19-AD
- FR document: 2016-26010
- Official PDF: https://openairdocs.org/files/sha256/16/be/16bea887f63f0e932cecb72c8749012f8f74c659831849319d4f8e1e394ceaa0 (from https://www.govinfo.gov/content/pkg/FR-2016-11-01/pdf/2016-26010.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/11/01/2016-26010/airworthiness-directives-cfm-international-sa-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7797D2E75B394A818625805E005441B7.0001
- Page: https://openairdocs.org/proposed/FAA-2016-9128

## Summary

We propose to adopt a new airworthiness directive (AD) for certain CFM International S.A. (CFM) CFM56-5B turbofan engines. This proposed AD was prompted by reports of the failure of the radial drive shaft (RDS) on CFM CFM56-5B engines. This proposed AD would require removal of the RDS assembly and the RDS outer housing and their replacement with parts eligible for installation. We are proposing this AD to prevent failure of the RDS, which could lead to failure of one or more engines, loss of thrust control, and damage to the airplane.

## Notices in this docket

- Nov 1, 2016: Notice of proposed rulemaking (NPRM). (first notice), FR document 2016-26010, comments due Dec 16, 2016 (https://www.federalregister.gov/documents/2016/11/01/2016-26010/airworthiness-directives-cfm-international-sa-turbofan-engines)

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