# Proposed AD FAA-2017-0491: Sikorsky Aircraft Corporation Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2017-19-01
- Products: Sikorsky
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 5, 2017, 82 FR 25748
- Comments due: August 4, 2017
- Became: [AD 2017-19-01](https://openairdocs.org/ad/2017-19-01)
- Docket: FAA-2017-0491 (https://www.regulations.gov/docket/FAA-2017-0491, where comments are filed)
- Project: 2016-SW-020-AD
- FR document: 2017-11128
- Official PDF: https://openairdocs.org/files/sha256/46/66/46668810197ca1ca7b96f039037e96747a4289ab0ea94cebd1f74eb0140b9fbd (from https://www.govinfo.gov/content/pkg/FR-2017-06-05/pdf/2017-11128.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/06/05/2017-11128/airworthiness-directives-sikorsky-aircraft-corporation-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9759DEA252472AD686258136004C672C.0001
- Page: https://openairdocs.org/proposed/FAA-2017-0491

## Summary

We propose to adopt a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-76A, S-76B, S-76C, and S-76D helicopters. This proposed AD would require inspecting the main rotor (M/R) servo pushrod (pushrod) assembly and applying slippage marks. This proposed AD is prompted by an accident of a Sikorsky Model S-76C helicopter caused by a failed pushrod assembly. The proposed actions are intended to prevent an unsafe condition on these products.

## Notices in this docket

- Jun 5, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2017-11128, comments due Aug 4, 2017 (https://www.federalregister.gov/documents/2017/06/05/2017-11128/airworthiness-directives-sikorsky-aircraft-corporation-helicopters)

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