Commonwealth legislation

AD/PDH/4 - Model 4/4000/6 Blade - 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This Act has been repealed and is no longer in force. It is retained for historical reference.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

What this is: A mandatory safety instruction (called an Airworthiness Directive) issued by the Civil Aviation Safety Authority (CASA) for specific aircraft propeller blades.

Who it affects: Anyone who owns, maintains, or operates aircraft using De Havilland variable pitch propellers (specifically models PD66/446/2 and PD96/446/1) fitted with Model 4/4000/6 blades.

What it requires: Before installing any of these blades on an aircraft, you must carry out a specific modification to the blade. The exact steps for the modification are found in two technical documents:

De Havilland Maintenance Handbook Series 4HF No. 118, or
Airworthiness Notice 107.1.4.9.5.1

Why it matters: This ensures the propeller blades meet current safety standards and are airworthy (safe to fly) before being put into service. Ignoring this directive would violate aviation safety regulations.

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Current sections

Direct links to the current provisions in AD/PDH/4 - Model 4/4000/6 Blade - Modification.

AD/PDH/4 - Model 4/4000/6 Blade - 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 - De Havilland

AD/PDH/4 Model 4/4000/6 Blade - Modification NK

Applicability: All blades fitted to types PD66/446/2 and PD96/446/1 propellers. Document: 1. DH MHS Series 4HF No. 118; or

ANO 107.1.4.9.5.1.

Compliance: Before installation in an aircraft.

Source text

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