A C-340; SITTING IDLY BY AT THE RAMP IN A PARKED POS; SUFFERS A JET BLAST ENCOUNTER. ACFT DAMAGED.

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I WAS PLT OF A LEAR 25. DUE TO FESTIVITIES ON THE ISLAND; THE ARPT WAS EXTREMELY CONGESTED. THE LINEMEN WERE PARKING ALL ACFT IN A TIGHT T-HANGAR FORMATION. AT OUR 5 O'CLOCK POS WAS A CESSNA 340; AT OUR 7 O'CLOCK POS WAS A PIPER AZTEC. OUR ACFT WAS FACING SE. THE 340 AND AZTEC WERE FACING NW WITH OUR TAIL POINTING BTWN THEIR WINGTIPS. THERE WAS APPROX 15 FT BTWN THEIR WINGTIPS; ALLOWING AMPLE ROOM FOR OUR JET BLAST TO GO BTWN THE OTHER ACFT WINGS. MY COPLT AND I ASSESSED THE SIT AND BOTH AGREED THAT DUE TO THE CONGESTION OF THE ARPT AND THE LACK OF GND PERSONNEL TO REPOSITION THE ACFT IN A TIMELY MANNER; THE MOST PRACTICAL THING TO DO WAS TO DEPART FROM OUR PARKING SPOT USING MINIMUM THRUST. WHILE AWAITING OUR TAXI CLRNC; I WAS AT IDLE PWR WHEN A LINEMAN IN A FUEL TRUCK PULLED IN FRONT OF US; AND ALSO ASSESSED THE POS OF OUR JET BLAST. AFTER A MOMENT OR SO; HE DROVE AWAY WITHOUT ANY GESTURE OF CONCERN OR IMPENDING PROB. DUE TO A SLIGHT UP-SLOPE IN THE RAMP; MY INITIAL PWR SELECTION WAS NOT ENOUGH TO CARRY US FORWARD AND THROUGH OUR TURN INTO THE RAMP BTWN ROWS OF ACFT. ABOUT HALFWAY THROUGH THE TURN; THE ACFT BEGAN TO SLOW; AND I REALIZED I WOULD NEED TO INCREASE THRUST TO MAKE THE TURN. THERE WERE NO LINEMEN AROUND TO HELP GUIDE ME AT THIS TIME. I CONTINUED MY TAXI TO THE ACTIVE RWY. DURING MY TAXI; THE TWR CONTACTED ME AND ASKED ME TO CONTACT THE FBO. I CALLED THEM; AND THEY INFORMED ME THAT MY JET BLAST MAY HAVE CAUSED DAMAGE TO THE CESSNA 340; AS I MADE THE TURN OUT OF THE PARKING SPOT. I CHOSE TO TAXI BACK TO THE RAMP TO CHK ON THE PROB. THE 340'S R FLAP AND R AILERON WERE DAMAGED; SO I WENT INTO THE FBO TO LEAVE THE APPROPRIATE INFO FOR THE 340'S OWNER AS THE FBO WAS UNABLE TO LOCATE HIM IN TOWN. ON RETURN TO HOME BASE; I CALLED THE FBO; AND THE 340'S OWNER WAS THERE. WE TALKED; AND HE DECIDED THAT THE DAMAGE WAS NOT ENOUGH TO BE CONSIDERED SUBSTANTIAL OR ENOUGH TO REQUIRE NTSB NOTIFICATION. IN THE FUTURE; IF A SIMILAR SIT ARISES; OUR POLICY WILL NOW BE TO HAVE THE ACFT TOWED TO AN UNCONGESTED AREA FOR START; REGARDLESS OF LACK OF PERSONNEL OR DEP DELAY AND WILL ADVOCATE THIS TO OTHER PLTS.