Commonwealth legislation

AD/PR/21 - Hub Assembly - Inspection of Blade Sockets

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

What this does: Orders a one-time safety inspection of specific aircraft propellers to find dangerous cracks in the hub assembly.

Who it affects: Operators of Argosy 222 aircraft using Dowty Rotol propellers (model R212/4-30-4/22/1) that have not been modified according to Mod. VP 2388.

What you must do: Using a basic magnifying glass (3X magnification), visually check the entire outside surface of the hub part (P/N RA60600) for cracks. Pay special attention to two high-risk areas:

The spaces between the blade sockets
The rear half of the socket circumferences

Deadline: Complete the inspection within 25 hours of flight time after 1 November 1978.

Why it matters: Fatigue cracks in propeller hubs can cause the propeller to fail during flight. This simple visual check catches structural damage before it becomes catastrophic.

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Current sections

Direct links to the current provisions in AD/PR/21 - Hub Assembly - Inspection of Blade Sockets.

AD/PR/21 - Hub Assembly - Inspection of Blade Sockets

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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/21 Hub Assembly - Inspection of Blade Sockets NK

Applicability: All model (c) R212/4-30-4/22/1 propellers (Argosy 222), not modified in accordance with Mod. VP 2388.

Requirement: With the aid of a 3X magnifying glass, visually inspect for cracks the complete accessible exterior surface of the hub P/N RA60600, paying particular attention to the areas between the blade sockets, and the rear half circumference of the sockets.

Compliance: Within 25 hours time in service after 1 November 1978.

Source text

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