What was found
(CAN) DURING CLIMB, PILOT OBSERVED PROP RPM AND TORQUE FLUCTUATIONS OF NR 1 ENGINE. RPM FLUCTUATING 700-1000 RPM WITH TORQUE FLUCTUATING 90 PERCENT-110 PERCENT. COMMANDED SHUTDOWN OF ENGINE CARRIED OUT BY CAPTAIN. IAW BBD RECOMMENDATION, TROUBLESHOOTING WAS FOCUSED ON THE NR 1 POWER CONTROL MICROSWITCH. AFTER FUNCTIONAL/CONTINUITY TEST WAS 6141-S3 MICROSWITCH WAS CONFIRMED INTERMITTENT AND FAULTY. S3 MICROSWITCH WAS REPLACED AND GROUND-RUN COMPLETED. AFTER THE REPLACEMENT OF OF FAULTY S3 MICROSWITCH. IT PASSED THE FOLLOWING SYS CHECKS PERFORMED: MINIMUM GOVERNING PROP SPEED, MAXIMUM GOVERNING PROP SPEED. PROP UNDERSPEED FUEL GOVERNING CHECKS. BETA BACKUP & POWER LEVER LIMIT TEST SWITCH 5. MAXIMUM REVERSE CHECK. PROP OVERSPEED GOVERNOR TEST. PROP SYNCHROPHASING CHECK. ECU REVERSION CHECK. ELECTRICAL CONTROL REVERSION OPERATIONAL TEST FOR BETA LOCK-OUT SYSTEM WAS ALSO CARRIED-OUT BY MAINTENANCE, THE SYS OPERATES NORMALLY.