A300 TAXIING INTO GATE; AND FOLLOWING MARSHALLER'S DIRECTIONS; HAS ENG STRIKE THE JETWAY WHICH IS MISPOSITIONED.

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FLT SJU TO MIA. A300. THE FLT HAD BEEN UNEVENTFUL FROM SJU AND THE WX WAS CLR. AFTER LNDG; WE WERE CLRED TO TAXI TO OUR GATE. ONCE ABEAM THE GATE IN THE ALLEYWAY; THE CAPT TURNED THE ACFT LEFT TOWARDS THE EXTENDED YELLOW LINE AND BEGAN COMPLYING WITH THE MARSHALLER'S WAND INSTRUCTIONS. WE WERE MOVING FORWARD AT 1-2 MPH. MY JOB AT THIS POINT IS TO VISUALLY VERIFY CLRNC OF THE PLANE'S R SIDE TO AVOID ANY GND EQUIP. WITH APPROX 10 FT TO GO; I ALTERNATE MY ATTN FROM THE R WINDOW TO THE MARSHALLER IN FRONT. THOUGH THE CAPT'S ATTN IS USUALLY 100 PERCENT TO THE FRONT MARSHALLER; I SAW HIM GLANCE DOWN TO HIS L AT OUR COMPANY MECH. HE THEN APPLIED FINAL BRAKES. AFTER THIS; THE MARSHALLER RAISED HIS WANDS TO THE CROSSED (STOPPED) POS. THERE SEEMED TO BE CONFUSION AMONGST THE GND PERSONNEL. THE JETWAY WAS REPOSITIONED AND THE MARSHALLER DIRECTED US FORWARD A SHORT DISTANCE. FOLLOWING THE PAX DISEMBARKING; OUR MECH SHOWED THE CREW WHERE THE TOP PORTION OF THE #1 ENG NOSE COWL WAS DAMAGED FROM STRIKING THE UNDERSIDE OF THE JETWAY. SUBSEQUENT DISCUSSIONS AND WRITTEN STATEMENTS REVEALED THE CAUSE OF THE MISHAP. WHEN ANTICIPATING OUR ARR; THE GND PERSONNEL HAD PREPOSITIONED THEIR CHOCKS BESIDE THE A310 HASH MARK; AND DIRECTED THE JETWAY OPERATORS TO POS THE JETWAY TO THAT POINT. THE MARSHALLER CONTINUED MOTIONING US FORWARD TRYING TO GET US TO THE A300 HASH MARK. HE DID NOT NOTE THE JETWAY'S POS; NOR DID HE COMPLY WITH THE URGINGS OF OUR MECH OR REF HIS L WING WALKER. CONTRIBUTING FACTOR: MISPLACEMENT OF THE CHOCKS. (WE DON'T HAVE AN A310 IN OUR FLEET.) THE MARSHALLERS NEED TO BE TRAINED TO DIVIDE THEIR ATTN BTWN THE WING WALKERS AND THE HASH MARK. THEY SHOULD NOT FIXATE SOLELY ON THE NOSEWHEEL.