What was found
ON TAXI, ENGINE HAD TO BE SHUT DOWN DUE TO LOW RPM AND HIGH ITT IN BETA. MAINTENANCE DISCOVERED PROPELLER GOVERNOR HAD FAILED INTERNALLY CAUSING MODERATE AMOUNTS OF GROUND METAL TO BE PUMPED INTO NOSE CASE. GOVERNOR SHAFT SEIZED. ENGINE REMOVED FOR TEAR-DOWN INSPECTION DUE TO ZERO TORQUE AND HIGH OIL PRESSURE AFTER GOVERNOR WAS CHANGED. SUSPECT METAL CONTAMINATION. OIL COOLER, ENGINE, AND OIL CHANGED. ALL OIL LINES FLUSHED. GOV SENT TO GARRETT AND ENGINE SENT TO GARETT SERVICE CENTER. GARRETT P/N IS 894418-6Y.