# Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters
> **Rule** · Final rule; request for comments. · Published 2012-07-17 · Effective 2012-08-01 · 77 FR 41889
## Document
- **Document number:** 2012-16944
- **Category:** airworthiness
- **Manufacturer:** Sikorsky
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 77 FR 41889
- **Publication date:** 2012-07-17
- **Effective date:** 2012-08-01
- **FAA docket:** Docket No. FAA-2012-0715
## Abstract

We are adopting a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This AD requires inspecting the main gearbox (MGB) for a crack. This AD is prompted by a crack in the cored passage of the MGB housing, which may be indicated by oil on the housing. These actions are intended to detect a crack in the MGB housing, which could result in loss of oil, failure of the MGB, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/07/17/2012-16944/airworthiness-directives-sikorsky-aircraft-corporation-helicopters)
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