# Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters
> **Rule** · Final rule. · Published 2017-11-28 · Effective 2018-01-02 · 82 FR 56165
## Document
- **Document number:** 2017-25558
- **Category:** airworthiness
- **Manufacturer:** Sikorsky
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 82 FR 56165
- **Publication date:** 2017-11-28
- **Effective date:** 2018-01-02
- **FAA docket:** Docket No. FAA-2017-0491
## Abstract

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

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2017/11/28/2017-25558/airworthiness-directives-sikorsky-aircraft-corporation-helicopters)
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