What was found
(CAN) IN APPROCH PILOT NOTICE THAT LT PROP RPM CHANGED FROM 850 TO 1070 RPM STEADY (OVERSPEED GOVERNING )WITH A PEC CAUTION LIGHT AND A POWERPLANT MESSAGE ON ENGINE DISPLAY. PILOT FEATHER LT PROP IAW PROCEDURE AND COMPLETED AN SAFE APPROCH AND LANDING. ENGINE FAULT CODE 160 RECORDED FROM NR 1 ENGINE ONE BUS BAR FOUND PROTECTION DAMAGED AND CHAFED ON THE PROP MAGNETIC PICK-UP. SUSPECT THAT WHEN PILOT APPLIED PROP ANTI-ICE THE PEC RECORDED A FAULTY RPM READ-OUT, CAUSING THE PEC TO GO TO OVERSPEED GOVERNING CONDITION. BUSS BAR REPLACED BETWEEN BLADE NR 2 AND 3 ALL OTHER INSPECTED FOR PROPER CLEARANCE SOME REPOSITIONNATED PROPERLY .FAULT CLEARED ALL SYSTEM FONCTIONNALLY TESTED SERVICEABLE.