# Airworthiness Directives; Robinson Helicopter Company Model R22 Helicopters
> **Rule** · Final rule. · Published 1997-12-08 · Effective 1998-01-12 · 62 FR 64511
## Document
- **Document number:** 97-31677
- **Category:** airworthiness
- **Manufacturer:** Robinson Helicopter Company Model R22
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 62 FR 64511
- **Publication date:** 1997-12-08
- **Effective date:** 1998-01-12
- **FAA docket:** Docket No. 97-SW-04-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to Robinson Helicopter Company (Robinson) Model R22 helicopters with a Lycoming 0-360-J2A engine installation. This AD requires replacing the carburetor and carburetor air temperature (CAT) gage with an improved carburetor that does not require manual leaning of the fuel/air mixture during flight, and a remarked CAT gage; and revising the Rotorcraft Flight Manual to remove the reference to leaning the engine. This amendment is prompted by a report from the Civil Aviation Authority of Great Britain that cautioned that the mixture control could inadvertently be placed in the idle cutoff position during in-flight manual leaning of the fuel/air mixture in the carburetor of the Lycoming 0-360-J2A engine. The actions specified by this AD are intended to prevent inadvertent placement of the mixture control to the idle cutoff position during in-flight leaning of the engine, which could result in an engine shutdown and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/12/08/97-31677/airworthiness-directives-robinson-helicopter-company-model-r22-helicopters)
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