COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 180, 182 and Wren 460 Series Aeroplanes AD/CESSNA 180/51 Goodyear Fuel Cells 6/78 Applicability: All Cessna models 180 and 182 and Wren 460 fitted with Goodyear BTC-39 fuel cells. Requirement: Action in accordance with Cessna SL No. SE78-10. Compliance: Within 100 hours time in service after 30 June 1978 and annually thereafter as detailed in Cessna SL No. SE78-10.