What was found
ON TAKE OFF ROLL NR 1 ENGINE WAS SLOW TO COME TO TAKEOFF POWER. DURING FLIGHT WITH THROTTLES ALIGNED, NR 1 ENGINE N1 WAS 10% BEHIND THE OTHER ENGINES. ON GROUND AFTER LANDING ENGINE NR 1 WAS 900 LBS FUEL FLOW WHILE ENGINES NR 2 & NR 3 WERE 1300-1500 FUEL FLOW LBS PER HOUR. COMPLETED #1 ENGINE INSTALLATION AND COWLING CLOSED PER WIC 71T0707-1 AND 710000-00-93. IDLE LEAK CHECKED OK, IDLE FUEL FLOW WAS NORMAL AT 1450LBS/HR. PERFORMED MAX POWER ASSURANCE ENG RUN PER JRH ALL NUMBERS WITHIN PARAMETERS, PERFORMED ACCELERATION CHECK ON ENG #1 AND 3 FOR COMPARISON PER JRH CHP 7. CHECKED OK, ALL PARAMETERS FOR BOTH ENGINES MATCH. NO FAULTS NOTED AT THIS TIME.