COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Agusta A109 Series Helicopters AD/A109/14 Main Landing Gear Wheels 13/88 Applicability: A109A and A109AII. Requirement: Action in accordance with Bollettino Tecnico 109-71. Note: RAI AD 88-142 refers. Compliance: Before 30 March 1989. Background: Excessive torque on the retaining nut has caused failure of the aluminium retaining washer and loss of the wheel.