JUST AFTER DINNER STATION 3'S A39 WAS ALERTED TO THE AIRPORT FOR A POSSIBLE ARM APMUTATION. A39 ARRIVED ON SCENE A SHORT TIME LATER TO FIND AN 18 YOF WITH A LOWER ARM AMPUTATED BY AN AIRPLANE PROPELLER. THE AMBULANCE CREW WENT TO WORK TO STABLIZE AND PACKAGE THE PATIENT WITH HELP FROM MEDIC 2 AND THE EMS SUPERVISOR "901". THE PATIENT WAS THEN PACKED AND TAKEN TO MSP TROOPER 3'S HANGER FOR TRANSPORT TO UNION MEMORIAL.