Commonwealth legislation

AD/PR/1 - Pitch Lock Cylinder - Modification

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

This is an Airworthiness Directive (a mandatory safety order) issued by the Civil Aviation Safety Authority (CASA) that requires owners and operators to modify the pitch lock cylinder on specific aircraft propellers.

What it does: The directive mandates a mechanical modification to prevent failures in the propeller's pitch control system. The pitch lock cylinder is a component that stops propeller blades from changing their angle (pitch) unintentionally during flight.

Who it affects: Anyone operating aircraft fitted with these specific Dowty Rotol propeller models:

What must be done: Operators must follow the technical instructions in Dowty Rotol Service Bulletin No. 61-231 to perform the modification. This is not optional—non-compliance means the aircraft cannot legally fly.

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Current sections

Direct links to the current provisions in AD/PR/1 - Pitch Lock Cylinder - Modification.

AD/PR/1 - Pitch Lock Cylinder - 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 Propellers - Variable Pitch - Dowty Rotol

AD/PR/1 Pitch Lock Cylinder - Modification NK

Applicability: All model (c) R193/4-30-4/50, (c) R184/4-30/4/50, (c) R179/4-20-4/33. Document: Dowty Rotol SB No. 61-231.

Compliance: As detailed in the Requirement Document.

Source text

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