COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Sikorsky S-76 Series Helicopters AD/S-76/40 Power Train Tail Drive Shaft Bearing Support Assembly 9/85 TX Applicability: All model S76 which have bearing support assembly bearings manufactured by MRC installed. Requirement: Action in accordance with Sikorsky Alert Service Bulletin No. 76- 66-20. Compliance: Before further flight after 31 July 1985. Background: It has been determined that some bearings manufactured by MRC may have been assembled without grease.