What was found
WHILE ON A TRAINING MISSION, THE PILOT NOTICED THE FUEL FLOW WAS 18 GPH DURING CLIMB, PILOT REPORTED FUEL FLOW WAS NORMAL ON TAKEOFF. ON TROUBLESHOOTING, THE MX FOUND THE ARM ON THE MIXTURE SIDE WAS VERY ROUGH. FUEL METERING UNIT WAS REPLACED AND RUN-UP WAS PERFORMED, OPS CHECK GOOD. NO PROBABLE CAUSE OR RECOMMENDATIONS AT THIS TIME. (K)