AN LTT CREW; TAXIING FROM FBO RAMP AT PVD; ALLEGEDLY BLEW OVER A LIGHT ACFT THAT WAS PARKED ON THE RAMP.

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AT XA45 WE TAXIED ONTO FBO RAMP AND WERE PARKED BY A LINE SVC MAN AND ASKED IF WE NEEDED ANYTHING. AFTER TELLING HIM OUR NEEDS; HE FUELED US AND I DID A POSTFLT INSPECTION AND WENT TO WAIT ON OUR PAX. AT XA50 WE ESCORTED OUR PAX TO THE ACFT AND BOARDED THEM. I THEN DID ANOTHER WALKAROUND TO CHK FOR ANY PROBS AND OBJECTS IN THE WAY. I THEN BOARDED THE ACFT; BRIEFED THE PAX; AND WENT THROUGH THE CHKLISTS AND STARTED THE ENGS. AFTER THE START WE WENT THROUGH THE AFTER START CHKLIST AND CALLED GND FOR TAXI CLRNC AND STARTED TO TAXI. WE MADE A NORMAL L TURN OUT OF PARKING; AFTER PASSING THROUGH APPROX 210 DEGS (90 DEGS OF TURN). I WAS UNABLE TO STEER THE ACFT; IT WAS STUCK IN A L TURN; SO I STOPPED THE TAXI AND CANCELED THE TAXI CLRNC WITH GND. I THEN PROCEEDED TO SHUT DOWN THE ACFT AND TALK TO THE PAX ABOUT WHY WE STOPPED. AFTER OPENING THE DOOR AND GETTING OUT; I WAS TOLD THAT A CESSNA HAD TILTED ON ITS R WING. I LOOKED OVER BEHIND WHERE THE POLICE OFFICER WAS LOOKING AND SAW ARPT OPS; FIRE TRUCK; ARPT POLICE. HE ASKED IF I HAD NOTICED OR KNEW ANYTHING ABOUT THE CESSNA. I TOLD HIM I DID NOT. AT THIS POINT HE SAID THAT HE NEEDED MY IDENT AND ASKED IF I HAD USED A LOT OF PWR. I ONLY USED ENOUGH TO GET THE AFT MOVING JUST NORMAL BREAKAWAY THRUST. IT WAS NOT KNOWN WHEN THE CESSNA WAS TIPPED BUT THE POLICE OFFICER ASKED EVERYONE IN THE AREA BUT NO ONE HAD SEEN IT HAPPEN. HE THOUGHT THAT WITH THE STRONG WIND AND POSSIBLY A LITTLE JETBLAST IT MAY HAVE CAUSED THE ACFT TO TIP ONTO ITS R WING. HE ALSO DISCUSSED HOW IT WAS NOT SECURED FOR THE WX CONDITIONS -- NO TIEDOWNS AND ONLY 1 SET OF CHALKS ON THE R MAIN TIRE. THIS ACFT WAS ALSO PARKED BY FBO PERSONNEL. I NOTICED DURING THE NEXT SEVERAL DAYS WITH THE SAME APPROX WIND DIRECTION KT VELOCITY THAT THEY PARKED ALL OTHER TRANSIENT ACFT FACING THE OTHER WAY ON THEIR RAMP. I BELIEVE THAT THE CESSNA WAS TIPPED BY A GUST OF WIND.