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Thu, Nov 06, 2003

Urgent CASA (AUS) AD: R-22

AD/R22/51 Main Rotor Clutch Shaft 13/2003 DM

Applicability: All R22 helicopters.

Compliance: Requirement 1: Unless previously accomplished; within 10 hours time in service from the effective date of this directive.
Requirement 2: Before installation in a helicopter.

This Airworthiness Directive becomes effective on 12 November 2003.

Background: This directive has been issued in response to the preliminary findings of the
investigation of a fatal R22 accident. That investigation has disclosed evidence of
fatigue in a fractured main rotor clutch drive shaft. The failed shaft had been
assembled with the yoke painted in the area of the yoke to shaft assembly bolts and a
non-approved jointing compound was found in the area of the joint mating surfaces.
A combination of the two discrepancies probably resulted in a loss of assembly torque
and movement of the joint in service.

FMI: www.casa.gov.au/avreg/aircraft/ad/adfiles/rotor/r22/R22-051.pdf

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