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/31 Amdt 1 Control Torque Tube Assembly - Inspection 9/79 Applicability: Airtourer 100 and 115. Requirement: Inspect both upper and lower cut outs in the Control Column Torque Tube P/N 52131/30 for cracking. The area can be inspected by removing the arm rest front panel P/N 53018/1. Compliance: At intervals not exceeding 100 hours time in service after 30 September 1979.