# Airworthiness Directives; Sikorsky Aircraft Corporation Model S92-A Helicopters
> **Rule** · Final rule; request for comments. · Published 2007-08-21 · Effective 2007-08-21 · 72 FR 46553
## Document
- **Document number:** E7-15980
- **Category:** airworthiness
- **Manufacturer:** Sikorsky
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 72 FR 46553
- **Publication date:** 2007-08-21
- **Effective date:** 2007-08-21
- **FAA docket:** Docket No. FAA-2007-28971
## Abstract

This amendment adopts a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S92-A helicopters. This action requires, within a specified time, borescope inspecting a certain part-numbered tail rotor pitch change shaft and bearing assembly (shaft and bearing assembly) and also inspecting after any installation. This amendment is prompted by an incident involving failure of a shaft and bearing assembly and servo clevis shaft resulting in loss of tail rotor control. The actions specified in this AD are intended to prevent failure of a shaft and bearing assembly, loss of tail rotor pitch and yaw control, and subsequent loss of control of a helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/08/21/E7-15980/airworthiness-directives-sikorsky-aircraft-corporation-model-s92-a-helicopters)
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