Commonwealth legislation

AD/GOV/3 - Speed Adjusting Lever Retention - Modification

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

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Commonwealth

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legislative instrument

Plain English Summary

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What this is: An Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA).

Who it affects: Owners and operators of multi-engine piston aircraft fitted with Woodward lever-type propeller governors (devices that automatically adjust propeller blade angle to maintain constant engine speed).

What it requires: You must modify the governor to ensure the speed adjusting lever (the control that sets the engine RPM) stays firmly in place and cannot slip or move unintentionally. The modification must follow the specific instructions in Woodward Service Bulletin No. 33549, Paragraph 4 ("Corrective Action").

When to comply: By the next time the governor is overhauled, provided that overhaul happens after 1 January 1974.

Why it matters: Prevents accidental movement of the speed control, which could cause sudden engine overspeed or loss of power — a significant safety risk in multi-engine aircraft.

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AD/GOV/3 - Speed Adjusting Lever Retention - Modification

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Propeller Governors

AD/GOV/3 Speed Adjusting Lever Retention - Modification 10/73

Applicability: All Woodward lever type governors installed in multi piston engined aircraft.

Requirement: Modify the governor to provide positive speed adjusting lever retention in accordance with Woodward SB No. 33549 Para. 4, under "Corrective Action".

Compliance: At next overhaul completed after 1 January 1974.

Source text

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