COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Victa and A.E.S.L. Airtourer Series Aeroplanes AD/VAT/40 Elevator Centre Rib Structure - Modification 10/75 Applicability: All models. Document: Aerospace Airtourer SB No. 038. Compliance: Within 100 hours time in service after 31 October 1975.