What was found
CREW SELECTED FLAPS UP ON ROLL-OUT. ACFT SAT FOR A COUPLE OF HOURS, PRE-FLIGHT CHECKS WERE NORMAL. PRIOR TO TAKEOFF, FLAPS WERE SET TO TAKEOFF POSITION. AT THIS TIME SMOKE WAS OBSERVED IN THE CABIN. EMERGENCY DRILL WAS CARRIED OUT AND THE ACFT EVACUATED AT THE END OF THE RUNWAY. ACFT WAS TOWED BACK TO THE FBO. MX CONFIRMED THAT THE FLAPMOTOR WAS THE CAUSE OF THE SMOKE. THE FLAPMOTOR CIRCUIT BREAKER HAD ALSO TRIPPED. THE MX DEPARTMENT IS CONTINUING TO INVESTIGATE THE CAUSE.