Commonwealth legislation

AD/HILLER 12/3 - Tail Rotor Blade Assembly - Provision of Vent Hole

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

1/10 complexity

Owners and operators of Hiller UH-12A, UH-12B and UH-12C helicopters must modify the tail rotor blade assembly by adding a vent hole per the manufacturer’s Service Information Letter No. 133. This mandatory airworthiness directive prevents trapped moisture, internal corrosion and blade imbalance that could cause catastrophic tail rotor failure; the required compliance date was 15 February 1961.

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AD/HILLER 12/3 - Tail Rotor Blade Assembly - Provision of Vent Hole

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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 Hiller UH-12 Series Helicopters

AD/HILLER 12/3 Tail Rotor Blade Assembly - Provision

of Vent Hole Applicability: All models UH-12A, UH-12B and UH-12C. Document: Hiller SIL No. 133.

Compliance: Before 15 February 1961.

2/61

Source text

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