COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES De Havilland Piston Engines AD/DHE/19 Crankshaft - Inspection and Modification 4/66 Applicability: Gipsy Queen 30 series engines modified to Mod. 2036 or Mod. 2162. Document: Bristol Siddeley TNS GQ 30 No. 70 dated 16 Nov. 1965 and Gipsy Mod. No. 2925. Compliance: Inspect within 100 hours time in service after 15 April 1966 and thereafter at intervals not exceeding 400 hours time in service until Mod. 2925 is incorporated. Modify before installation in an aircraft following next overhaul completed after 15 April 1966.