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/14 Carburettor Airbox Alternate Air Valve 10/75 Applicability: Models: 7ECA with S/Nos 723-70 and subsequent. 7GCAA with S/Nos 205-70 and subs. 7GCBC with S/Nos 202-70 and subs. 7KCAB with S/Nos 202-70 and subs. 8KCAB with S/Nos 4-71 and subs. 8GCBC with S/Nos 1-74 and subs. Requirement: Inspect the carburettor airbox alternate air valve for cracking and security of attachment. Note: Incorporation of a Bellanca Service Kit does not cancel this repetitive inspection. Compliance: Within 100 hours time in service after 31 October 1975 and there-after at intervals not exceeding 100 hours time in service.