GND PERSONNEL VEHICLE DRIVER HAD HIS HAT SUCKED INTO THE #1 ENG OF A CANADAIR REGIONAL JET; CL65; AFTER GATE PARKING. THE FLC HAD NOT HEARD OF THE INCIDENT AND DEPLANED FOR THEIR OVERNIGHT STAY. RPTR STATES THAT THE CABIN DOOR WAS NOT OPEN BEFORE THE ENG SHUT DOWN. THEREFORE; THE STATION AGENT MUST HAVE COME UP TO THE ENG DURING SHUTDOWN AND PAX WERE DEPLANING.

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I WAS IN MONTREAL; CANADA. THEY HAD HAD SNOW THAT RESULTED IN SLIPPERY RWYS; TXWYS; AND RAMPS. SINCE THE RAMP WAS SO SLIPPERY; I ELECTED TO KEEP BOTH ENGS RUNNING UNTIL I WAS PARKED. NORMALLY; WE SHUT DOWN THE #1 ENG DURING THE TAXI TO THE GATE; IN GOOD WX. WHEN THE GND CREW SHOWED ME THAT THE ACFT WAS CHOCKED; I TURNED OFF THE #1 GENERATOR; #1 BOOST PUMP; THEN SHUT OFF THE FUEL TO THE #1 ENG. AT THAT POINT; I TURNED OF THE SEAT BELT SIGN WHICH SIGNALS THE FLT ATTENDANT TO OPEN THE CABIN DOOR. AFTER I GOT TO THE HOTEL; THIS WAS OUR LAST LEG OF THE DAY; I HAD A PHONE MESSAGE FROM THE CAPT WHO TOOK OVER FROM ME. HE HAD BOARDED HIS FLT BEFORE BEING TOLD THAT A RAMP AGENT HAD HIS HAT SUCKED OFF HIS HEAD AND INTO THE #1 ENG ON MY LEG. NO ONE TOLD ME AND HE WASN'T TOLD UNTIL AFTER HE BOARDED HIS PAX. THE GND CREW SAID THAT THE ENG WAS RUNNING AND PAX WERE DEPLANING WHEN THE HAT WAS SUCKED INTO THE ENG. THE ENG WAS NOT RUNNING IF THE DOOR WAS DOWN AND PAX WERE DEPLANING. IT WAS COASTING DOWN AFTER BEING SHUT DOWN; BUT IT WAS NOT RUNNING AT FULL PWR. THE RAMP CREW SAID THAT IT WAS ABOUT 1 TO 1 1/2 MINS AFTER WE WERE CHOCKED THAT THE INCIDENT HAPPENED. I DON'T KNOW HOW LONG AFTER SHUTDOWN THAT THE ENG PRODUCES ENOUGH SUCTION TO PULL THE HAT OFF OF A PERSON'S HEAD. THE AGENT WHO LOST THE HAT DROVE THE BELT-LOADER UNDER THE #1 ENG TO THE CARGO DOOR. WHEN HE STOOD UP FROM THE DRIVER'S SEAT; THAT PUT HIS HEAD IN FRONT OF THE #1 ENG INTAKE.