COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 185 Series Aeroplanes AD/CESSNA 185/19 Nose Wheel Pivot Bolt 12/73 Applicability: All amphibian models with Scott nose wheel assemblies. Requirement: Retire the nose wheel pivot bolt from service. Compliance: a. Within 100 hours time in service after 31 January 1974 for those nose wheel pivot bolts which have achieved 500 hours time in service, and thereafter at intervals not exceeding 600 hours time in service. b. All other nose wheel pivot bolts before achieving 600 hours time in service and thereafter at intervals not exceeding 600 hours time in service.