COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 56TC (Turbo Baron) Series Aeroplanes AD/BEECH 56/17 Goodyear Fuel Cells 6/78 Applicability: Models 56TC and A56TC with S/Nos. TG-2 to TG-94, fitted with Goodyear BTC-39 fuel cells. Requirement: Action in accordance with Beechcraft SI No. 0895. Compliance: Within 100 hours' time in service after 30 June 1978 and thereafter at intervals not exceeding twelve months.