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/2 Fuel Burner Shroud Nut Hardness 11/87 Applicability: All Dart RDa-6, RDa-7 series engines fitted with fuel burners of any modification standard other than Mod. 1626. Requirement: 1. Inspect fuel burner shroud nuts for hardness in accordance with the requirements of Rolls Royce SB Da 73-68 and Da 73-A81 as applicable; or 2. AD/RRT/15 Amdt 1. Compliance: As detailed in Requirement documents. Background: Reissue of AD/RRT/15 Amdt 1.