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-3/22 Elevator Tab Control Arm 10/67 Applicability: All models. Requirement: Action in accordance with De H Canada SB No 3/4. Compliance: Within 50 hours time in service after 2 November 1967.