What was found
DURING CRUISE FLIGHT WITH LT & RT PROP DE-ICE SELECTED ON, THE PILOT OBSERVED SMOKE COMING OUT OF THE LT PROP DE-ICE SWITCH & CB. THE PILOT ATTEMPTED TO TURN THE SWITCH & CB OFF, & DISCOVERED IT WAS STUCK IN THE ON POSITION. PILOT ISOLATED THE BUSS FOR THE SWITCH & LANDED WITHOUT INCIDENT. INSPECTED ACFT, PROPELLER DE-ICE SYS, & FOUND NO PROBLEMS OTHER THAN THE SWITCH & CB STUCK IN THE ON POSITION & EXHIBITED SIGNS OF OVERHEAT.