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 180/38 Nose Wheel Pivot Bolt 1/74 Applicability: All amphibian models with Scott nose wheel assemblies. Requirement: Retire the nosewheels pivot bolts from service. Compliance: 1. Within 100 hours time in service after 31 January 1974 for those nosewheel pivot bolts which have achieved 500 hours time in service and thereafter at intervals not exceeding 600 hours time in service. 2. All other nosewheel pivot bolts, before achieving 600 hours time in service and thereafter at intervals not exceeding 600 hours time in service.