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Airworthiness Directive 97-25-05

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Official AD 97-25-05 · FR doc 97-31677 · 1997-12-08 · airframe

Airworthiness Directives; Robinson Helicopter Company Model R22 Helicopters

What this AD requires

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.

Which aircraft AD 97-25-05 applies to

MakesRobinson Helicopter Company
ModelsR22 Beta II, R22 Mariner II, R22
Part-conditional — C604-6, A604-2.

Replace MA-4-5 carburetor and CAT gage P/N C604-6 with MA-4SPA carburetor and remarked CAT gage P/N A604-2 per Robinson R22 Service Bulletin SB-82 and KI-114 O-360 carburetor change kit; insert R22 POH Section 9 Supplements 7 (Beta II) and 8 (Mariner II).

Whether AD 97-25-05 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

How AD compliance is recorded

A valid compliance record (14 CFR 43.9) states:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.
Date — When the work was done.
Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.
Signature & certificate — The A&P/IA who returned it to service, with certificate number.
Is AD 97-25-05 complied with on your aircraft?

Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.

Look up a tail number →Read the full directive (Federal Register)

Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.