# Proposed AD 97-SW-04-AD: Robinson Helicopter Company Model R22 Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 97-25-05
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 19, 1997, 62 FR 27211
- Comments due: July 18, 1997
- Became: [AD 97-25-05](https://openairdocs.org/ad/97-25-05)
- Docket: 97-SW-04-AD
- FR document: 97-13082
- Official PDF: https://openairdocs.org/files/sha256/27/4c/274c8ac212b917f68e131674b039ea2236044322fbc7ef573cb553121cd6c7fa (from https://www.govinfo.gov/content/pkg/FR-1997-05-19/pdf/97-13082.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/05/19/97-13082/airworthiness-directives-robinson-helicopter-company-model-r22-helicopters
- Page: https://openairdocs.org/proposed/97-SW-04-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to Robinson Helicopter Company (Robinson) Model R22 helicopters with a Lycoming O-360-J2A engine installation. This proposal would require 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 proposal 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 O-360-J2A engine. The actions specified by the proposed 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.

## Notices in this docket

- May 19, 1997: Notice of proposed rulemaking (NPRM). (first notice), FR document 97-13082, comments due Jul 18, 1997 (https://www.federalregister.gov/documents/1997/05/19/97-13082/airworthiness-directives-robinson-helicopter-company-model-r22-helicopters)

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