COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes AD/DHC-8/9 Flap Track No.5 Fail Safe Straps 10/89 Applicability: Serial number 1 through 119. Requirement: Action in accordance with Boeing Canada DHC-8 Service Bulletin No. 8-57-10 dated 31 March 1989. Note: Transport Canada AD CF-89-02 refers. Compliance: Within 500 hours time in service after 5 October 1989, or prior to 5 January 1990, whichever occurs first. Background: Some fatigue failures have occurred on subject straps because of incorrect installation.