AN ACR B737 FLC HAD A RWY EXCURSION WHEN THEY LANDED ON A SLICK RWY WITH A DIRECT XWIND. THE WX WAS; APPARENTLY; MUCH WORSE THAN RPTED AND THE ACFT SLID OFF THE L SIDE OF THE RWY DURING ITS ROLLOUT THEN RETURNED TO CTRLINE WITH NO DAMAGE.

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THIS STATEMENT CONCERNS THE OP OF A FLT BTWN SLC-IDA ON OCT/THU/97. THIS WAS THE SECOND DAY OF A 4 DAY ROTATION DEPARTING OCT/WED/97. ON OCT/THU/97; THE FIRST LEG OF THE DAY WAS FLT FROM PHL-SLC. THE SECOND LEG WAS FLT FROM SLC-IDA. I SERVED AS FO AND PF OF THAT FLT. I WAS ACCOMPANIED BY A CAPT; WHO WAS PNF. THE ACFT WAS A B737- 200. THE TKOF; DEP; ENRTE; ARR AND APCH PHASES OF FLT INTO IDA WERE UNEVENTFUL AND NORMAL. ZLC CLRED FLT FOR AN ILS RWY 20 APCH. ON APCH TO IDA RWY 20; A COMPLETE PROC TURN WAS EXECUTED. THE AUTOPLT WAS DISCONNECTED FOR LNDG. PRIOR TO APCH; WE CONTACTED THE LCL ACR'S OBSERVER (IDA) FOR THE LATEST WX RPTED. OBSERVER RPTED THE IDA WX AT XA04Z AS 500 FT BROKEN 1600 FT OVCST; 3/4 MI VISIBILITY WITH LIGHT SNOW; WINDS 240 DEGS AT 10 KTS; TEMP 0 DEGS C AND DEWPOINT 0 DEGS C. THE RWY 20 TOUCHDOWN APPEARED NORMAL. DURING TOUCHDOWN; THE INITIAL ROLLOUT MOVED QUICKLY TO THE L; WHICH WAS NOT RECOVERABLE UNTIL AN APPARENT EXCURSION OCCURRED. THE ACFT WAS RETURNED TO THE CTR OF THE RWY WITH RUDDER AND CTL WHEEL STEERING. THE REMAINDER OF THE ROLLOUT WAS NORMAL. WE TAXIED CLR OF THE RWY AND TO THE GATE. UPON ARR; ACR OPS AND MAINT CTL WERE NOTIFIED OF THE POSSIBLE EXCURSION. LCL (CONTRACTED) MAINT WAS CONTACTED TO INSPECT THE ACFT. THE ACFT WAS INSPECTED AND CLRED FOR FURTHER FLT. ADDITIONALLY PRIOR TO ARR WE CONTACTED THE ACR WX OBSERVER WHO RPTED THAT 40 MINS PRIOR TO OUR ARR; AN ACFT LANDED IN LIGHT SNOW WITH GOOD BRAKING. WE OBSERVED WINDS TO BE MUCH STRONGER; HVY BLOWING SNOW; RWY SURFACE AS 'SLICK' WITH APPROX 1 1/2 INCHES OF SNOW ON THE RWY. BRAKING ACTION WAS POOR TO NIL. THE RWY ENVIRONMENT WAS VERY DARK WITH ONLY RWY EDGE LIGHTS VISIBLE. AFTER OUR ARR; WINDS WERE RPTED AS 290 DEGS AT 19 KTS AT XC05.