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-3/29 Engine Mounting Frame 1/78 Applicability: All models. Requirement: Action in accordance with De H Canada SB No 3/31. Compliance: At engine overhaul. Federal Register of Legislative Instruments F2006B09078