What was found
AFTER ENG STARTUP & DURING TAXI TO RUNWAY, PILOT & MEDICAL CREW SMELLED A BURNING WIRE SMELL. PILOT TURNED AROUND BEFORE TAKEOFF & RETURNED TO HANGAR WITH NO OTHER INCIDENCE. A 15 MINUTE GND RUN UP WAS PERFORMED WITH THE ACFT IN FULL TAKEOFF CONFIGURATION. BOTH GENS & INVERTER BROUGHT ONLINE. ECS, PRESSURIZATION, AIR CONDITIONER, BLOWER FANS, WINDSHIELD HEAT, PROBE HEAT, PROP HEAT, MEDICAL POWER, EXTERIOR & INTERIOR LIGHTS WERE TURNED ON, AS WELL AS THE FLAPS BEING IN THE 15 DEGREE POSITION FOR TAKEOFF. EVERYTHING WAS OPERATING NORMAL & NO DEFECTS OR SMELLS WERE NOTED. AFTER THAT THE ACFT WAS SHUTDOWN & THE PILOT & MECHANIC DECIDED TO TAKE THE ACFT FOR A TEST FLIGHT. THE STARTUP, TAXI, TAKEOFF, FLIGHT & LANDING OF THE ACFT WAS ALL NORMAL WITH NO DEFECTS OR SMELLS NOTED. THE ACFT WAS RETURNED TO SERVICE.