Document ID: chunk:federal_register_of_legislation:F2006B06420:body:0
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
 SCHEDULE OF AIRWORTHINESS DIRECTIVES

 Robinson R22 Series Helicopters

AD/R22/13 Tail Rotor Drive Shaft - Replacement 8/82

 Applicability: Models R22 with S/Nos. 0002 to 0282. Document:  Robinson SB.21.
 Compliance: Within 100 hours time in service after 30 September 1982.

            Background:  There have been reported cases of tail rotor drive shaft whipping, due to inadvertent rotor overspeed. A higher frequency shaft is introduced to reduce the possibility of drive shaft whip, and subsequent failure.