COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES DHC-6 (Twin Otter) Series Aeroplanes AD/DHC-6/18 Amdt 1 Rudder and Elevator Pulley Bracket Assembly Stn 106 - Inspection 6/69 Applicability: All models not incorporating Mod. No. 6/1262. Requirement: Visually inspect the elevator rudder pulley bracket assembly at Fuselage Station 106 with particular attention to the forward flange of the top and bottom beams outboard of the outboard lightening holes for cracking or deformation. Compliance: Forthwith, then at intervals not exceeding 25 TIS after 1 September 1971.