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-76/12 Upper Deck Flight Controls Installation - Modification 7/80 Applicability: All models S76 with S/Nos. 76003 and 76005, 760001 to 760006, 760009 and 760011 to 760015. Document: Sikorsky CSB 76-67-1. Compliance: Within 100 hours time in service after 31 July 1980. Background: Rework of a bracket and angle is necessary to increase the clearances for rigging pin installation and roll gradient spring cylinder operation.