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 104/35 Amdt 1 Applicability: All models. Aircraft Life Extension 7/77 Document: British Aerospace TNS Dove (104) No. 240 Issue 2. Compliance: As detailed in the requirement document. NOTE: Wing spar boom safe lives are detailed in the current issue of AD/DH 104/5. the manufacturer has advised that the aircraft life cannot be extended beyond two wing spar boom lifetimes.