COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Eurocopter AS 350 (Ecureuil) Series Helicopters AD/ECUREUIL/45 Tail Rotor Pitch Control Lever Expansion Pin 9/91 DM Applicability: All AS350 Helicopters versions B, B1, B2 and D. Requirement: Action in accordance with the Technical Requirements of DGAC TAD T91-137-059 (B). Note: Aerospatiale TSB 01-33 refers. Compliance: A specified in the requirement document with revised effective date of 10 July 1991. Background: One lug of the tail rotor gearbox control lever hinge yoke failed through incorrect assembly of the bushes on the expansion pin.