Commonwealth legislation

AD/S-76/13 - Tail Rotor Outboard Retaining Plate Bolts - Inspection

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

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Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

What this does: This is a mandatory safety order requiring inspection of specific bolts in the tail rotor assembly of certain Sikorsky S-76 helicopters.

Who it affects: Owners and operators of S-76 helicopters with serial numbers SS 76005 through 76007, and SS 760001 through 760050.

What must be done: Inspect the bolts on the tail rotor's outboard retaining plate within 100 hours of flying time after 30 September 1980.

Why it matters: The manufacturer discovered these bolts could develop dangerous cracks where the bolt head meets the shaft (the "head to shank radius"). If these bolts fail, the tail rotor could detach, causing loss of control and potential crash. This directive forces operators to check for this defect before it causes catastrophic failure.

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AD/S-76/13 - Tail Rotor Outboard Retaining Plate Bolts - 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 Sikorsky S-76 Series Helicopters

AD/S-76/13 Tail Rotor Outboard Retaining Plate Bolts - Inspection

Applicability: All models S-76 with S/Nos. SS 76005 to 76007, and SS 760001 to 760050. Document: Sikorsky CSB 76-65-11.

Compliance: Within 100 hours time in service after 30 September 1980.

9/80

Background: The manufacturer has advised that the retention bolts may exhibit defects in the head to shank radius.

Source text

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