COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 35 (Bonanza) Series Aeroplanes AD/BEECH 35/20 Amdt 2 Plastic Control Wheel 12/70 Applicability: All models fitted with non-reinforced plastic control wheels. Requirement: Visually inspect all plastic non-reinforced control wheels for cracking. Control wheels in which cracks are present shall be replaced with a serviceable item before further flight. It is recommended that replacements should be of the metal reinforced type. Compliance: At intervals not exceeding 100 hours time in service.