Commonwealth legislation

AD/BELL 204/7 - Tail Rotor Yoke - Inspection

In ForceCTH

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Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This directive requires owners/operators of Bell 204B helicopters fitted with tail rotor yokes P/N 204‑010‑781‑5 or ‑9 to perform recurring magnetic‑particle inspections of the yoke spindle (with specified current limits) at intervals not exceeding 100 flight hours.

It forces repeated NDT of a critical threaded spindle to catch cracks early, imposing recurring inspection costs, downtime and reliance on correct technique and equipment.

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AD/BELL 204/7 - Tail Rotor Yoke - Inspection

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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 Bell Helicopter Textron 204 Series Helicopters

AD/BELL 204/7 Tail Rotor Yoke - Inspection NK

Applicability: All 204B models fitted with tail rotor yoke P/N 204-010-781-9 or 204-010-781-5.

Requirement: Inspect yoke assembly P/N 204-010-781-5 or 204-010-781-9 by magnetic particle method with particular emphasis on the threaded portion of the yoke spindle.

Maximum amperage 1400 amps. DC or 1100 amps. AC. Do not exceed 4200 ampere turns.

Compliance: At intervals not exceeding 100 hours time in service, after 6 October 1968.

Source text

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