COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Navion Series Aeroplanes AD/NAV/1 Wing Panel - Inspection and Modification NK Applicability: All models D, E, F and G with S/Nos. NAV-4-2 and subsequent. Document: 1. Navion SL No. 85; or 2. FAA AD 64-4-5. Compliance: At intervals not exceeding 100 hours time in service.