Commonwealth legislation

AD/PDH/2 - Model 3/1000/2 - Propeller Retaining Nut - Inspection

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This Act has been repealed and is no longer in force. It is retained for historical reference.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: An Airworthiness Directive (a mandatory safety order) issued by the Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations.

What it does: Requires aircraft owners and operators to inspect the propeller retaining nuts on specific De Havilland propellers (model 3HFB, also designated 3/1000/2). These nuts are critical safety components—they hold the propeller blades to the hub. If one fails, the blade could detach in flight.

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

What you must do: Carry out inspections of the retaining nuts strictly in accordance with the procedures and timing specified in either:

De Havilland Technical Bulletin Series 3HFB No. 50; or
Air Navigation Order 107.1.4.5.6.1.

The directive doesn't detail the inspection steps itself; it simply makes compliance with those external technical documents legally mandatory.

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Direct links to the current provisions in AD/PDH/2 - Model 3/1000/2 - Propeller Retaining Nut - Inspection.

AD/PDH/2 - Model 3/1000/2 - Propeller Retaining Nut - Inspection

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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/2 Model 3/1000/2 - Propeller Retaining Nut - Inspection NK

Applicability: All model 3HFB (3/1000/2) propellers. Document: 1. DH Tech. Bulletin Series 3HFB No. 50; or

ANO 107.1.4.5.6.1.

Compliance: As detailed in the requirement document.

Source text

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