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/20 High Pressure Turbine Nozzle Guide Vanes 11/87 Applicability: All Dart RDa-6 series engines. Requirement: 1. Action in accordance with Rolls Royce SB Da 72-451 Rev 5; or 2. AD/RRT/33. Compliance: As detailed in the Requirement Document. Background: Reissue of AD/RRT/33.