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/9 Fuselage Structure and Control Cables 8/72 Applicability: Models 7GCAA, 7GCBC, 7KCAB and 8KCAB not fitted with an approved battery box which will ensure that battery acid spillage is drained overboard. Requirement: 1. Inspect the elevator and rudder control cables in the battery area for evidence of corrosion caused by battery acid spillage. 2. Inspect the battery compartment area for evidence of battery acid corrosion of airframe components other than control cables. 3. Install a battery box which will ensure that any acid spillage is drained overboard. Compliance: For Paras. 1 and 2 - Within 10 hours time in service or 30 days after 29 August 1972 whichever occurs first and thereafter at intervals not to exceed 25 hours time in service until modified in accordance with Para 3. For Para. 3 - Before 1 March 1973.