Commonwealth legislation

AD/S-76/30 Amdt 1 - Tail Rotor Blade Elliptical Centering Plug and Retaining Pad

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Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

AD/S-76/30 Amdt 1 requires operators of Sikorsky S‑76A helicopters to modify the tail-rotor elliptical centering plug and retaining pad in accordance with Sikorsky Service Bulletin SB 76-65-35 Rev A. Compliance must be done within 25 hours time-in-service after 13 October 1994 unless already completed. Amendment 1 removes a prior repetitive inspection requirement because no further failures were reported after the inspection and modification.

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Current sections

Direct links to the current provisions in AD/S-76/30 Amdt 1 - Tail Rotor Blade Elliptical Centering Plug and Retaining Pad.

AD/S-76/30 Amdt 1 - Tail Rotor Blade Elliptical Centering Plug and Retaining Pad

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Sikorsky S-76 Series Helicopters

AD/S-76/30

Amdt 1

Applicability: Model S76A.

Tail Rotor Blade Elliptical Centering Plug and Retaining Pad

12/94

Requirement: Action in accordance with Sikorsky SB 76-65-35 Rev A.

Note: FAA AD 94-14-20 refers. This supersedes FAA AD 84-06-02.

Compliance: Unless already accomplished, within 25 hours time in service after 13 October 1994.

The effective date of the initial issue was 27 February 1984.

Background: An operator encountered severe vibration during flight while executing a left turn after take-off. Investigation revealed disbonding of the aluminium elliptical spar plug which allowed the tail rotor blade to be displaced in a radial direction. Amendment 1 withdraws the repetitive inspection requirement as a result of no further reports of failure following the inspection and modification in accordance with the Service Bulletin.

Source text

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

1 AD/S-76/30 Amdt 1 - Tail Rotor Blade Elliptical Centering Plug and Retaining Pad