COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 320 Series Aeroplanes AD/CESSNA 320/23 Main Landing Gear Attachment - Inspection Applicability: All models 320 to 320D inclusive. Requirement: With aeroplane on jacks: 1. Remove Main Landing Gear Attaching "U" Bolts and Shafts. 8/75 2. Visually inspect the "U" Bolts, with the aid of a 10X glass, in the area of the thread root ends for cracks. 3. Visually inspect the Attaching Shafts, with the aid of a 10X glass, in the area of the roll pin hole for cracks. Compliance: 1. For MLG attachment shafts and "U" bolts which have achieved 2500 hours at 12 August 1975; within 100 hours time in service and thereafter at intervals not exceeding 200 hours time in service. 2. All other MLG attachment shafts and "U" bolts; before achieving 2500 hours time in service and thereafter at intervals not exceeding 200 hours time in service.