B737 FLT CREW TAXIES INTO BLAST FENCE AND DAMAGES WINGTIP AT BNA.

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POS: BNA RAMP POS BTWN TXWY 5 AND TXWY 6; NEAR JET BLAST FENCE. LANDED EARLY IN BNA. WE GOT GATE INFO THAT THE GATE WOULD BE OCCUPIED FOR A FEW MORE MINS. FO CALLED GND CTL AND WE WERE INSTRUCTED TO TAXI AND HOLD NEAR THE JET BLAST FENCE BTWN TXWYS 5 AND 6. TAXIING TOWARD THE SPOT I LOOKED AT THE CAPT'S COCKPIT CLOCK TO HAVE THE TIME AWARENESS FOR THE PA ANNOUNCEMENT. I WAS DISTRACTED ENOUGH TO CONTINUE A SLOW SHALLOW L TURN TOWARDS THE FENCE INSTEAD OF A PERPENDICULAR ENTRY. FACING FORWARD AT THE OPPOSITE END OF THE FENCE WAS A MAINT STAND. I FOCUSED ON THAT OBSTACLE; LOSING FOCUS ON THE FENCE ON MY R SIDE. AT THAT TIME; I NOTICED THE FO JUMPING AND SAYING; 'STOP; WE WILL HIT THE FENCE.' I TRIED TO STOP THE PLANE WHILE STEERING TO THE L AND AT THE SAME TIME I HEARD A SCRATCHING NOISE. WE HIT THE FENCE WITH THE R WINGTIP. I SECURED THE ACFT; COMMUNICATED WITH THE FLT ATTENDANTS AND PAX; AND CALLED THE COMPANY. WE COMPLETED THE CHKLISTS AND TOOK CARE OF THE 50 PAX TO BE DEPLANED SAFELY TO CONTINUE THEIR DAY.