What was found
AILERON TRIM APPEARS TO BE FREEZING UP IN FLIGHT AT FL 380 AT -28 C RAT. THE ROLL TRIM ANNUNCIATOR ILLUMINATED, WAS UNABLE TO MOVE THE AILERON TRIM KNOB UNTIL THE RAT WAS +10 C. THE RUDDER TRIM WAS MOVING FREELY AT -28 RAT BOTH OPERATE NORMALLY ON THE GROUND. LUBED AILERON TRIM ACTUATOR WITH SILICON GREASE (DC-33) PER M/M. INSPECTED TRIM WHEEL IN COCKPIT AND VISIBLE CABLES FOR BINDING OR SEIZED PULLIES. CHECKED TRIM RODS FROM ACTUATOR TO TRIM TAB FOR BINDING AND CORRECT INSTALLATION. NO DEFECTS NOTED. AILERON TRIM TAB, OPS CHECKS GOOD AT THIS TIME I/A/W CE 560 M/M CH 27-11-00