# Airworthiness Directives; Sikorsky Aircraft Corporation Model S-92A Helicopters
> **Rule** · Final rule; request for comments. · Published 2006-05-31 · Effective 2006-06-15 · 71 FR 30798
## Document
- **Document number:** 06-4911
- **Category:** airworthiness
- **Manufacturer:** Sikorsky
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 71 FR 30798
- **Publication date:** 2006-05-31
- **Effective date:** 2006-06-15
- **FAA docket:** Docket No. FAA-2006-24875
## Abstract

This amendment adopts a new airworthiness directive (AD) for the specified Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This action requires inspecting each main transmission assembly mounting bolt (bolt) for wear or corrosion, and if wear or corrosion is found, replacing the bolt, bolt barrel nut, and cage. This amendment is prompted by a report of a failure of a bolt that was discovered during a routine maintenance inspection. The actions specified in this AD are intended to prevent failure of a bolt, which could result in loss of support of the main transmission and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/05/31/06-4911/airworthiness-directives-sikorsky-aircraft-corporation-model-s-92a-helicopters)
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