COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Robinson R22 Series Helicopters AD/R22/12 Amdt 2 Upper Steel Tube Frames 11/86 Applicability: All models with S/Nos. 0002 to 0311 having A020-2 steel tube frames S/Nos. 0002 to 0399 installed. Requirement: Inspect in accordance with Robinson S.B. No. 47. Compliance: Within 50 hours time in service after 31 May 1986 and thereafter as detailed in the Requirement Document. Background: Service Bulletin No. 47 supersedes S.B.'s 3, 18 and 23; and requires inspection of all welded areas of the A020-2 frame. This amendment reduces the frame applicability serial numbers from 0002-0400 to 0002-0399.