# Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters
> **Rule** · Final rule. · Published 2017-04-07 · Effective 2017-05-12 · 82 FR 16897
## Document
- **Document number:** 2017-06708
- **Category:** airworthiness
- **Manufacturer:** Sikorsky
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 82 FR 16897
- **Publication date:** 2017-04-07
- **Effective date:** 2017-05-12
- **FAA docket:** Docket No. FAA-2015-7095
## Abstract

We are adopting a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This AD requires removing from service the tail gearbox center housing (housing) when it has 12,200 or more hours time-in-service (TIS). This AD was prompted by fatigue analysis conducted by Sikorsky that determined the housing required a retirement life. The actions are intended to prevent an unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2017/04/07/2017-06708/airworthiness-directives-sikorsky-aircraft-corporation-helicopters)
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