COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES DH 104 (Dove) Series Aeroplanes AD/DH 104/36 Engine Mounting Frame Front Engine Support Spigots - Inspection Applicability: All models equipped with front engine support spigot P/N 4EM.681. Document: British Aerospace TNS Dove (104) No. 244 Issue 2. Compliance: Before 15 September 1981. 5/81 Background: A case has been reported to the manufacturer where the front engine support spigot, on an engine mounting frame, was found fractured.