COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Gates Learjet 35 and 36 Series Aeroplanes AD/LEARJET 35/8 Refrigeration System Condenser Fan - Inspection and Replacement 9/78 Applicability: Model 35 with S/Nos. 35-001 to 35-194. Model 36 with S/Nos. 36-001 to 36-040. And any 35/36 Series Learjet which has had a Condenser Fan changed since 1 July 1977. Requirement: 1. Inspect the P/No. rubber-stamped on a blade of the refrigeration condenser fan. 2. If the fan bears the P/No. 6608059-3, attach a placard worded as follows to the instrument panel adjacent to the refrigeration system control switch: WARNING DO NOT OPERATE REFRIGERATION SYSTEM UNDER ANY CIRCUMSTANCES ON THE GROUND OR IN THE AIR UNTIL FAN HAS BEEN REPLACED. Note: The correct fans have blades which taper in thickness towards the tip and bear the P/Nos. 6608059-2 or 6608059-4. or Gates Learjet SB 35/36-21-3. Compliance: Before further flight.