Commonwealth legislation

AD/S-76/34 - Electrical Power - Essential Bus Modification

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Commonwealth

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legislative instrument

Plain English Summary

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Requires all Sikorsky S‑76A helicopters fitted with Allison 250‑C30/250‑C30S engines to modify the essential electrical bus according to Customer Service Notice CSN 76‑149 (2 July 1984). Owners/operators must carry out the work within 100 flight hours from 21 August 1984 or by 15 September 1984. The mechanical change is intended to prevent an uncontained engine turbine wheel failure from causing loss of essential electrical services.

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AD/S-76/34 - Electrical Power - Essential Bus Modification

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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-76/34 Electrical Power - Essential Bus Modification 10/84

Applicability: All model S-76A Helicopters fitted with Allison 250-C30/250-C30S series engines. Requirement: Modify essential bus installation in accordance with Customer Service Notice CSN

76-149 dated 2 July 1984.

Note: FAA Emergency Telegraphic Airworthiness Directive AD No. T84-16-51 refers.

Compliance: Within 100 hours time in service from 21 August 1984 but no later than 15 September 1984.

Background: Uncontained engine turbine wheel failures have been experienced. This Directive requires modification of the essential bus installation such that turbine wheel failures will not result in the loss of essential electrical services.

Source text

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