COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 320 Series Aeroplanes AD/CESSNA 320/22 Tip Tank Fuel Seepage - Inspection 4/75 Applicability: All models fitted with strobe lights in the wing tip fuel tank nose cap. Document: 1. Cessna SL ME73-4; or 2. FAA AD 75-05-08. Compliance: Within 100 hours time in service after 30 April 1975 and thereafter at intervals not exceeding 100 hours time in service.