What was found
THE PILOT AND MEDICAL CREW BOTH REPORTED SEEING AND SMELLING SMOKE IN THE COCKPIT DIRECTLY AFTER TAKEOFF. THE PILOT THEN CYCLED THE DEMISTER/HEATER VALVES WITH NO CHANGE. HE THEN MADE AN UNSCHEDULED LANDING. MX WAS NOTIFIED AND RESPONDED IMMEDIATELY. THE MECHANIC PERFORMED A VISUAL INSP WITH NO DEFECTS NOTED. HE THEN HAD THE PILOT PERFORM A GROUND RUN AND CYCLED ALL THE DEMISTER AND HEATING KNOBS SEVERAL TIMES WITH NO DEFECTS. THE ACFT WAS RETURNED TO SERVICE AT THAT TIME.