Commonwealth legislation

AD/ENST 28/31 - Main Rotor Transmission Clutch Assembly

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Commonwealth

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legislative instrument

Plain English Summary

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AD/ENST 28/31 requires owners/operators of Enstrom F‑28 series helicopters fitted with Formsprag main rotor clutch P/N 28‑13401‑1 to inspect per Enstrom Service Directive Bulletin No 0068 and, if that part is fitted, replace it with P/N 28‑13401‑2 before further flight. Compliance must occur at the next maintenance‑release inspection or by 31 March 1989. The directive responds to clutch failures that caused severe damage; operators pay for inspection/replacement and maintenance authorities decide airworthiness to return the helicopter to service (Applicability; Requirement; Compliance; Background).

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AD/ENST 28/31 - Main Rotor Transmission Clutch Assembly

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Enstrom F-28 Series Helicopters

AD/ENST 28/31 Main Rotor Transmission Clutch Assembly 5/89

Applicability: All model F28 series helicopters equipped with P/N 28- 13401-1, Formsprag CL 40526-1 through -7 main rotor transmission clutch assembly.

Requirement: Action in accordance with Enstrom Service Directive Bulletin No 0068. Additionally, for F-28F, F280F and 280FX helicopters inspect clutch assembly for part number. If clutch P/N 28- 13401-1 fitted, replace with clutch P/N 28-13401-2 before further flight.

Note: FAA AD 89-04-09 refers.

Compliance: At next inspection for issue of a Maintenance Release or by 31 March 1989 whichever occurs first.

Background: Failure of the 28-13401-1 clutch has resulted in severe damage to helicopters.

Source text

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