What was found
PILOT RETURNED TO AIRPORT SHORTLY AFTER DEPARTURE (0.1 HOUR FLIGHT TIME). REPORTED BURNED ELECTRICAL ODOR IN COCKPIT. INVESTIGATION OF COMPLAINT REVEALED THAT THE FORWARD HEATER COMBUSTION BLOWER WAS NOISY AND VIBRATED DURING HEATER OPERATION, REMOVED BLOWER ASSY, FOUND MOTOR COMPONENTS, I.E. ENDPLATES AND FRAME LOOSE, FAN HUB LOOSE AND A 1.5 INCH X 0.5 INCH PIECE OF PAPER LODGED IN FAN. PAPER CAUSED FAN OUT OF BALANCE WHICH LED TO FAN AND MOTOR COMPONENTS VIBRATING LOOSE AND CAUSING MOTOR TO RUN HOT. (K)