What was found
DURING TAKEOFF, ACFT EXPERIENCED A NR1 PROPELLER UNSCHEDULED FEATHER. AIRCREW DECLARED AN EMERGENCY AND RETURNED TO FIELD. GROUND MX CREW PERFORMED TEST OF THE PLA AND CLA SWITCHES. NO FAULTS WERE FOUND. NR 1 TSCU WAS R & R, ENGINE WIRING HARNESS INSPECTED. FOUND THE TORQUE PROBE CONNECTOR PLUG LOOSE. CONNECTOR PLUG REMOVED, CLEANED AND RE-INSTALLED ONTO TORQUE PROBE. NO DISCREPENCIES WITH ENGINE WIRING HARNESS. PERFORMED GROUND RUNS AND SYS CHECKED SATISFACTORY. ACFT RELEASED FOR FLIGHT TEST. FLIGHT TEST CHECKED SATISFACTORY. ACFT RETURNED TO FLIGHT STATUS.