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-76/6 Hydraulic Pumps - Replacement 1/80 Applicability: All model S-76 with S/Nos. SS No. 76005, 76006 and 760001 through 760043. Document: Sikorsky CSB 76-29-1. Compliance: Within 100 hours time in service after 31 January 1980. Background: The manufacturer advises of the need to replace certain models of hydraulic pumps.