COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes AD/CL-600/7 Horizontal Stabiliser Pitch Trim Actuator - Modification Applicability: Pitch trim actuators as listed in requirement document. Document: Canadair Challenger Alert SB No. A600-0084. Note: Canadian Dept. of Transport AD CF-82-05 refers. Compliance: Before issue of Australian Certificate of Airworthiness. 3/83 Background: Pitch trim actuators are suspected of having possible loose motor drive gear pinions. This could result in damage to internal control wiring.