# Airworthiness Directives; Robinson Helicopter Company Model R22 Helicopters
> **Rule** · Final rule; request for comments. · Published 2000-04-20 · Effective 2000-05-05 · 65 FR 21136
## Document
- **Document number:** 00-9897
- **Category:** airworthiness
- **Manufacturer:** Robinson Helicopter Company Model R22
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 65 FR 21136
- **Publication date:** 2000-04-20
- **Effective date:** 2000-05-05
- **FAA docket:** Docket No. 99-SW-69-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to Robinson Helicopter Company (RHC) Model R22 helicopters. This action requires replacing certain serial number sprag clutches with an airworthy sprag clutch as specified in this AD. This amendment is prompted by several reports of clutch assemblies with cracked or fractured sprag ends. The actions specified by this AD are intended to prevent a sprag clutch failure, loss of main rotor RPM during autorotation, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/04/20/00-9897/airworthiness-directives-robinson-helicopter-company-model-r22-helicopters)
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