COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 50 (Twin Bonanza) Series Aeroplanes AD/BEECH 50/27 Goodyear Fuel Cells 6/78 Applicability: Models: D50E with S/Nos. DH-334 to DH-347; J50 with S/Nos JH-171 to JH-176; 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.