COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Robinson R22 Series Helicopters AD/R22/2 Tailcone Support Structure - Inspection 2/81 Applicability: All models R22 with S/Nos. 0002 to 0082. Requirement: To prevent loss of the tailcone resulting from supporting framework tube or tube weld fractures accomplish the following: 1. Using a dye penetrant technique inspect the tubes and welds for cracks per methods of, and in the areas identified as Items 1 to 4 of the figure of Robinson SB No. B-4. 2. On reassembling the P/N A 023 tailcone assembly use the following new parts: NAS - 679-A4 nut (5 each) NAS - 1304-22 bolt (4 each) NAS - 1304-3 bolt (1 each) Pal Nuts (5 each) Note: FAA AD 80-24-01 Amdt. 39-3975 refers. Compliance: Initially inspect before achieving 110 hours time in service after manufacture and thereafter at intervals not exceeding 100 hours time in service. Background: Cracks may develop in the tailcone support structure during normal service.