COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES American Champion (Aeronca, Bellanca) Series Aeroplanes AD/CHA/3 Fuel System Drain 10/71 Applicability: All models. Requirement: Install an approved fuel drain cock at the lowest point of the fuel system plumbing. Compliance: Before 29 October 1971.