COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Kawasaki BK 117 Series Helicopters AD/BK 117/3 Cowling Latches 2/90 Applicability: All models S/No. 1001 to 1006, 1008 to 1015 and 1017. Requirement: Action in accordance with Kawasaki SB KSB-117-047-1. Compliance: Prior to the issue of an Australian CofA. Background: Loss of the cowl resulted in the loss of an Australian aircraft.