COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Gates Learjet 24 & 25 Series Aeroplanes
AD/LEARJET/15 Refrigeration System Condenser
Fan - Inspection and Replacement
7/77
Model 24 with S/Nos. 24-100 to 24-356. Model 25 with S/Nos. 25-002 to 25-253.
And any 23/24 or 25 Series Learjet which has had a Condenser Fan changed since 1 July 1977.
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.
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 23/24/25-284.
Before further flight after 31 July 1977.