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-600/26 Flap Actuators 10/93 DM Applicability: Model CL-600-2A12 with serial numbers 3002 through 3066. Model CL-600-2B16 with serial numbers 5001 through 5131. Requirement: Action in accordance with Canadair Challenger Alert Service Bulletin A601-0415 or Alert Wire TA601-0415-036. Note: Transport Canada AD CF-93-18 refers. Compliance: Unless already accomplished, within 10 hours time in service after 11 August 1993 or prior to 11 September 1993, whichever occurs first. Background: The recent failure of a flap actuator was found to be caused by the incorrect installation of the shoulder bolt which secures the flap actuator to the wing trailing edge.