COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Eurocopter SA 360 and SA 365 (Dauphin) Series Helicopters AD/DAUPHIN/22 TRGB Mounting Tripod 3/89 DM Applicability: SA 365C, C1, C2, C3 helicopters. Requirement: Action in accordance with Aerospatiale SB 01.22A. Note: DGAC AD 88-189-030 (B) refers. Compliance: Within 50 hours time in service after 25 January 1989 and thereafter every 400 hours time in service. Background: Cracking initiated by corrosion has been detected at the root of one of the three arms of the tail rotor gearbox mounting tripod.