COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Rotax Piston Engines AD/ROTAX/5 Carburettor Contamination 11/96 Applicability: All Rotax 912 series engines up to and including engine serial number 4,076.244 and/or carburettor serial number 00151. Requirement: Examine the carburettor as per the requirements of Bombardier Rotax Technical Bulletin 912-09 dated 30 August 1995. Note: Austro Control (Austria) AD 83 dated 12 September 1995 refers. Compliance: Within 10 hours time in service from 10 October 1996. Background: Bombardier Rotax have reported that several carburettors have been found with contamination in the float chamber. This Directive requires examination of the carburettor to prevent the possibility of partial or complete blockage of the idle or main jet leading to poor performance or stoppage of the engine.