Commonwealth legislation

AD/HILLER 12/37 - Soloy Conversion: Power Turbine Governor Control System - Modification

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This directive mandates fitting the spring-bungee modification in Soloy Conversions S.B. 06-560 to the Power Turbine Governor Control on Soloy‑converted Hiller UH‑12D/E (4‑place) helicopters, to be done before the next Maintenance Release after 30 June 1985. It prevents loss of collective pitch control if the governor cable seizes; owners/operators pay parts and labour and must schedule the work during routine maintenance.

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AD/HILLER 12/37 - Soloy Conversion: Power Turbine Governor Control System - 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 Hiller UH-12 Series Helicopters

AD/HILLER 12/37 Soloy Conversion: Power Turbine

Governor Control System - Modification Applicability: All Soloy turbine conversion UH12D/E and E (4 Place) helicopters. Requirement: Soloy Conversions S.B. 06-560.

Compliance: Prior to the issue of the next Maintenance Release after 30 June 1985.

6/85

Background: The design, applicable prior to the issue of the Requirement Document, could result in loss of collective pitch control. This modification includes a spring bungee unit that will allow the collective lever to operate independently, if the governor cable seizes.

Source text

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