COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES DHC-3 (Otter) Series Aeroplanes AD/DHC-3/2 Rear Cargo Door NK Applicability: All models with S/Nos 2 to 15, 17, 22, 23 and 25 to 28. Requirement: Action in accordance with De H Canada TNS Otter No 17. Note: Canadian AD 54-3 refers. Compliance: Forthwith.