COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bell Helicopter Textron 47 (All Variants) Series Helicopters AD/BELL 47/89 Flight Control Systems - Hydraulic Servo to Swashplate Control Plate Attachment Bolts Applicability: All 47G, J and K series aircraft. Document: Bell Alert Service Bulletin 47-83-8. Compliance: By 31 December 1983. 10/83 Background: There have been two reported failures on AN Standard bolts, installed in the above flight control application where BHTI standard bolts should have been used.