A COMMERCIAL FIXED WING LGT ACFT ON TAXI TO THE GATE ENCOUNTERED GLARE ICE AND THE R MAIN GEAR DEPARTED THE TXWY. NO ACFT DAMAGE INCURRED.

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FLT DEPARTED EWR TO YMX ARPT DURING THE HRS OF DARKNESS AND WINTER CONDITIONS. WX WAS THOROUGHLY REVIEWED PRIOR TO DEP AND SEQUENCE/FORECAST RPTS WERE GOOD WITH NO MENTION OF TAXI OR RAMP CONDITIONS. DURING CRUISE/DSCNT PHASE INTO MONTREAL; THE ATIS RECORDING RPTED WX FOR APCH; LNDG; AND TAXI CONDITIONS. RWY 24 WAS RPTED AS THE ACTIVE RWY WITH GOOD BRAKING ACTION. ALL TXWYS WERE RPTED AS ROUGH ICE CONDITION; SOME TXWYS SANDED; AND NONE CLOSED. UPON LNDG; BRAKING ON RWY 24 WAS GOOD AND THE ACFT WAS SLOWED TO A VERY SLOW SPD AND CLRED AT THE NEAREST TXWY B4. TXWY B4 DID NOT HAVE THE APPEARANCE OF ANY ROUGH ICE OR SNOW ON ITS SURFACE AT ALL. TAXI LIGHTING SHINED BRIGHT ON THE BLACK ASPHALT SURFACE GIVING IT THE APPEARANCE OF A CLEAN AND ICE FREE SURFACE/TXWY. AS THE ACFT TRAVELED A FEW YARDS ON TXWY B4 IT BEGAN TO SLIDE PARALLEL AND TO THE R OF CTRLINE AT A VERY SLOW SPD (LESS THAN 3 KTS). THROTTLES WERE AT IDLE; BRAKING APPLIED; NOSEWHEEL STEERING AND DIFFERENTIAL BRAKING COULD NOT STOP THE ACFT ON THE TXWY EVEN AT THIS SLOW SPD. THE ACFT DRIFTED TO THE R SIDE OF TXWY B4 AND THE R MAIN WHEELS ENTERED THE R SHOULDER. PACKED SNOW IN FRONT OF THE R MAIN WHEELS BROUGHT THE ACFT TO A STOP. L MAIN WHEELS AND NOSEWHEEL TIRES REMAINED ON THE PAVEMENT. ARPT TWR; COMPANY PERSONNEL WERE CONTACTED FOR ASSISTANCE. ARPT TWR DISPATCHED A TEAM OF TRUCKS TO SAND TXWY B4. AFTER FURTHER COORD WITH COMPANY OPS AND MAINT; IT WAS DETERMINED THAT THE SNOW COULD BE REMOVED FROM THE R MAIN WHEELS AND THE ACFT PWRED BACK TO THE PAVEMENT B4 SAFELY -- AS WAS DONE. NO DAMAGE TO ACFT OR AIRFIELD EQUIP WAS NOTED. ALSO NOTED ATIS INFO CONTINUED TO RPT ALL TXWYS WERE ROUGH ICE CONDITIONS; SOME SANDED; BUT NO MENTION OF GLARE ICE ON ITS TXWYS OR RAMPS.