1AD/PMC/41 Amdt 1 - Propeller Hub Eddy Current Inspection

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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AIRWORTHINESS DIRECTIVE

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For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/PMC/41 and issues the following AD under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

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Propellers - Variable Pitch - McCauley

AD/PMC/41

Amdt 1

Propeller Hub Eddy Current Inspection 1/2004

Applicability: All McCauley threaded propeller hubs.

Requirement: Inspect the threaded area of the propeller hub assembly where the blade retention nut screws into the propeller hub using either:

The eddy current inspection (ECI) procedure detailed in McCauley standard practices manual (SPM) 101; or

b. An approved ECI procedure.

Note 1: NDI/EC/McCauley/41 constitutes one such technique.

Note 2: NDI/EC/McCauley/41 is only approved for the requirement detailed in this Directive. Refer CAR 2A (1988)

Compliance: Whenever the propeller is dissembled to a point that would allow access to the propeller hub threaded area.

This Amendment becomes effective on 22 January 2004.

Background: This amendment includes reference to the manufacturers procedure that is a required task to be carried out each overhaul. NDI/EC/McCauley/41 is approved only for the inspection requirement of this Directive.

A number of threaded hubs have failed during take-off resulting in propeller blade loss.

The original issue of this Directive became effective 21 April 1988.

Signature of James Coyne, Delegate of the Civil Aviation Safety Authority.

Jim Coyne

Image unavailable in extracted textDelegate of the Civil Aviation Safety Authority 4 December 2003

The above AD is notified in the Commonwealth of Australia Gazette on 24 December 2003.