SAAB 340B FLT CREW CONTACTS JET BRIDGE WITH PROP WHILE TAXIING TO THE GATE AT DTW UNDER MARSHALLER GUIDANCE.

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WE STOPPED SHORT OF GATE AS WE WAITED FOR A MARSHALLER AND WING WALKER. WHEN THEY WERE IN THEIR PROPER POS I RECEIVED THE SIGN TO COMMENCE THE TAXI-IN. MY FO AND I DID NOT NOTICE ANY OBSTACLES IN OUR WAY AS WE WERE MARSHALLED IN. AS WE CONTINUED THE TAXI-IN; I WAS FOCUSED ON THE MARSHALLER WHO WAS DIRECTING ME TOWARD HIM. HE LED ME STRAIGHT AHEAD AND ADJUSTED ME SLIGHTLY TO MY L DURING THE LAST FEW FEET AS HE BEGAN TO CLOSE HIS WANDS. I BEGAN TO APPLY BRAKE PRESSURE TO SLOW TO A STOP WHILE HIS WANDS WERE STILL SLOWLY COMING TOGETHER INDICATING WE HAD A LITTLE FURTHER TO GO WHEN WE HEARD A LOUD FANNING NOISE. I IMMEDIATELY LOOKED OUT MY SIDE WINDOW AND REALIZED THAT THE L PROP HAD STRUCK THE JETBRIDGE. I SET THE BRAKE AND SHUT DOWN THE ENGS AS QUICKLY AS POSSIBLE. THERE WAS NO SMOKE COMING FROM THE L ENG; NOR DID WE HAVE ANY SMOKE OR FIRE WARNINGS. ALL RAMP AGENTS APPEARED TO BE UNINJURED AS WELL AS PAX AND CREW. I ASSESSED THE DAMAGE NOTING THAT THE TIPS OF EACH PROP BLADE WERE SHEARED OFF AND THERE WAS SOME DAMAGE TO THE JETBRIDGE RAMP.