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/24 Fuel Servo Pipe 6/93 Applicability: Dart 506, 510, 511, 514, 515, 520, 525, 526, 527, 528, 529, 530, 532, 533, 534, 535, 536, 542, 543, 550, 552 series engines. Requirement: Inspect the fuel servo pipe in accordance with the requirements of Rolls Royce Alert Service Bulletin Da73-A86. Compliance: Prior to 30 June 1993. Background: This Directive requires a once only inspection of the fuel servo pipe. The requirement follows three reports of fuel leakage from the servo pipe between the fuel pump and the fuel control unit.