COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 55, 58 and 95-55 (Baron) Series Aeroplanes AD/BEECH 55/20 Amdt 1 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 after 31 December 1970.