TXWY EXCURSION.

Narrative

WITH THE CAPT FLYING THE ACFT; WE EXECUTED AN ILS APCH TO RWY 04 AT ROC. THE TOUCHDOWN WAS AT THE 1000 FT MARK AND ON SPD. THE AUTOBRAKE HAD BEEN SELECTED TO THE #2 SETTING AND THE ACFT DECELERATED NORMALLY; SLOWING TO 60 KTS WITH ABOUT 50 PERCENT OF THE AVAILABLE RWY REMAINING (4000 FT). AFTER LNDG; TWR DIRECTED US TO TAXI TO THE END OF THE RWY TO TURN OFF AND REQUESTED A BRAKING ACTION RPT. THE THRUST REVERSERS AND SPOILERS WERE STOWED AND MANUAL BRAKES APPLIED. BRAKING ACTION WAS DEEMED FAIR TO GOOD AND THE ACFT WAS SLOWED TO A MODERATE TAXI SPD. WITH ABOUT 1000 FT OF RWY REMAINING THE BRAKES WERE REAPPLIED AND AGAIN THE ACFT RESPONDED NORMALLY; SLOWING THE ACFT EVEN FURTHER. AT ABOUT 100 FT FROM THE END OF THE RWY LIGHT BRAKING WAS APPLIED TO SLOW THE ACFT TO TURN-OFF SPD. THERE WAS NO RESPONSE TO THIS BRAKING AND THE ACFT DID NOT SLOW AT ALL. BRAKE PRESSURE WAS INCREASED TO MAX BRAKING WITH NO APPARENT EFFECT ON DECELERATION. BECAUSE OF OUR SLOW TAXI SPD; I ELECTED TO TRY AND TURN THE CORNER RATHER THAN SLIDE OFF THE END OF THE RWY. THE CORNERING FORCES HOWEVER; WERE INSUFFICIENT TO NEGOTIATE A 90 DEG R TURN AND THE ACFT LNDG GEAR CLIPPED A SNOW BANK ADJACENT TO THE INTXN OF RWY 04 AND TXWY C. WE TAXIED INTO THE GATE AREA WITHOUT FURTHER INCIDENT. WE RPTED THE INCIDENT AND THAT BRAKING ACTION WAS 'NIL' AT THE RWY END TO THE TWR BY RADIO. AFTER SECURING THE ACFT AND RPTING THE INCIDENT TO MAINT; I CONTACTED THE ARPT GND CREW BY TELEPHONE. THEY RPTED THAT THEY HAD RE-SANDED AND VEHICLE TESTED THE RWY END AND THAT BRAKING ACTION WAS NOW RPTED AS FAIR. THEY ALSO RPTED INSPECTING THE AREA WHERE THE INCIDENT OCCURRED AND FINDING 1 DAMAGED TXWY LIGHT IN THE AREA. MAINT INSPECTED THE ACFT AND FOUND NO DAMAGE OR DISCREPANCIES AND RETURNED THE ACFT TO SVC. I ALSO RPTED THE INCIDENT TO OUR FLT OPS DUTY OFFICER AND COMPANY DISPATCHER. WE DEPARTED ROC ON OUR SUCCEEDING FLT ON SCHEDULE.