Commonwealth legislation

AD/R22/46 - MA-4-5 Carburettor

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Commonwealth

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legislative instrument

Plain English Summary

2/10 complexity

Requires owners/operators of Robinson R22 helicopters S/N 2571–2664 fitted with an MA‑4‑5 carburettor and CAT gauge P/N C604‑6 to replace both items using Robinson Service Bulletin 82 and Kit KI‑114 (Requirement). Compliance is mandatory within 50 hours time-in-service; the owner/operator pays the cost and must amend the flight manual after the change (Compliance; Background). The stated safety reason is to stop inadvertent selection of the mixture control to “idle cut” during manual leaning, which can cause in‑flight engine shutdown (Background).

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Current sections

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AD/R22/46 - MA-4-5 Carburettor

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Robinson R22 Series Helicopters

AD/R22/46	MA-4-5 Carburettor	3/98
Applicability:	All helicopters S/N 2571 through 2664 fitted with MA-4-5 carburettor and Carburettor Air Temperature (CAT) gauge P/N C604-6.

Requirement: Unless previously carried out, replace the carburettor and CAT gauge in accordance with the requirements of Robinson R-22 Service Bulletin 82, dated 03 March 1997, and Robinson Helicopter Company Kit KI-114 Revision A, dated 6 March 1997.

Note: FAA AD 97-25-05 Amdt 39-10228 refers.

Compliance: Within 50 hours time in service from the effective date of this Directive.

This directive become effective on the 26 February 1998.

Background: Advice has been received that the mixture control could inadvertently be placed in the idle cut position during in-flight manual leaning of the fuel/air mixture. This would cause an engine in-flight shut down with subsequent loss of helicopter control. When the carburettor is changed a flight manual amendment will be required.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/R22/46 - MA-4-5 Carburettor

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Robinson R22 Series Helicopters

AD/R22/46	MA-4-5 Carburettor	3/98
Applicability:	All helicopters S/N 2571 through 2664 fitted with MA-4-5 carburettor and Carburettor Air Temperature (CAT) gauge P/N C604-6.

Note: FAA AD 97-25-05 Amdt 39-10228 refers.

Compliance: Within 50 hours time in service from the effective date of this Directive.

This directive become effective on the 26 February 1998.