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/3 Vibration Absorber Mounting Flange - Inspection Applicability: All models not incorporating modification AMS 350.07.6063. Document: Aerospatiale AS 350 SB 05.03. 8/79 Compliance: Within 25 hours time in service after 4 July 1979 and thereafter at intervals not exceeding 25 hours time in service. Background: Several cracks have been found at the blending radius of the vibration absorber mounting flange installed on the main rotor shaft.