COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES American Champion (Aeronca, Bellanca) Series Aeroplanes AD/CHA/17 Wing Strut and Spar Attachment Bolt 11/77 Applicability: All model 8GCBC and 8KCAB. Requirement: Retire from service: 1. The front and rear wing strut upper and lower attachment bolts. 2. The front and rear wing spar to fuselage attachment bolts. Compliance: 1. For aircraft which have achieved 1000 hours time in service: within 200 hours time in service after 30 November 1977 and thereafter at intervals not exceeding 1200 hours time in service. 2. For all other Aircraft: at intervals not exceeding 1200 hours time in service. Note: For 8KCAB aircraft each hour engaged in aerobatics shall be counted as equivalent to 10 hours normal flight.