AN ACR ATR42 FLC ENCOUNTERS SEVERE TURB AND SEVERE CLR ICING DURING THEIR FLT. THE TURB CAUSED AN IMPROPERLY INSTALLED SEAT ROW TO SEPARATE FROM THE TRACK INJURING ONE OF THE PAX.

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SURFACE WINDS AT ORD WERE GUSTY. DEP AND TURB WAS SUSPECTED; BUT DURING OUR CLB BTWN 5000 FT AND 10000 FT MSL WE ENCOUNTERED TWO AREAS OF SEVERE TURB. IN THE SECOND INSTANCE WE HAD ENG CAUTION WARNING LIGHTS COME ON DUE TO THE JOLT; AND ATTITUDE HEADING INDICATOR FAILURE ON THE FO'S SIDE AND A PAX SEAT CAME OFF THE ATTACHMENT TRACKS IN THE CABIN. WE CONTINUED THE CLB AS THERE WERE RPTS OF SMOOTH AIR ABOVE 10000 FT. UPON REACHING SMOOTH AIR OUR FLT ATTENDANT SAID THERE WAS ONLY ONE SLIGHT INJURY IN BACK; BUT THE PERSON WAS NOT REQUESTING MEDICAL ATTN. WE PERFORMED A CHKLIST PROC TO REGAIN CTL OF THE FO'S ATTITUDE/HEADING INDICATOR AND MOVED PAX OUT OF THE BROKEN SEAT. WE THEN CHKED IN WITH OUR DISPATCH OFFICE AND PROCEEDED TO OUR DEST OF TVC. DURING THE CLB OUT OF ORD; BTWN 12500 FT AND 13500 FT WE ENCOUNTERED SEVERE CLR ICING; WITH SIDE WINDOW ICING; MEANING WE HAD TO USE OUR EMER SEVERE ICING CHKLIST. 100 MI AWAY; DURING OUR DSCNT INTO TVC; WE AGAIN ENCOUNTERED SEVERE CLR ICING AROUND 11000 FT. SO MUCH FOR THE AVIATION INDUSTRY 'EXPERTS' WHO SAY SEVERE CLR ICE (IE; FREEZING RAIN) IS A RARE OCCURRENCE. THE NEXT MORNING; OUR MAINT PEOPLE HAD DONE AN INSPECTION OF OUR ACFT AND FOUND THAT THE SEAT THAT CAME OFF THE TRACK HAD BEEN IMPROPERLY INSTALLED. WE WERE JUST LUCKY THE PEOPLE IN THAT SEAT WERE NOT INJURED.