COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Rolls Royce Turbine Engines - Dart Series AD/DART/21 Torque Pressure Indication 11/87 Applicability: All Dart RDa-6, RDa-7 series engines incorporating Mod. 1867. Requirement: 1. Action in accordance with Rolls Royce SB Da 77-A12; or 2. AD/RRT/37. Compliance: Forthwith. Background: Reissue of AD/RRT/37.