TEMPORARY LOSS OF ACFT CTL DURING INFLT ENCOUNTER WITH TSTM ACTIVITY.

Narrative

WHILE FLYING AS FO ON FLT FROM MIA TO MCO; WE ARE RERTED BY CTR FOR WX (TSTMS) TO MELBOURNE; THEN V6 TO MCO (RWY 17 APCH). WE ARE CLRED BY CTR TO DEV FOR WX (W OF COURSE). WE WERE SHOWING SOME SMALL CELLS BOTH SIDES OF COURSE AND WE WERE IN AND OUT OF CLOUDS AND WERE NOT SHOWING ANY WX TO OUR 12 O'CLOCK. AT APPROX XA10 WHILE THE CAPT WAS PROGRAMMING THE FMS AND I WAS CHKING THE RADAR PICTURE; WE SUDDENLY AND VERY UNEXPECTEDLY WERE IN MODERATE TO SEVERE TURB. WITHIN SECONDS (3-5) I HEARD THE AUTOPLT KICK OFF AND SAW ICE FORMING QUICKLY ON THE WINDSHIELD WIPER BOLT. THE CAPT WAS FLYING THIS LEG AND SO I ATTEMPTED TO TURN ON THE ENG AND WING ANTI ICE. THE TURB WAS NOW SO BAD THAT I MADE 3 ATTEMPTS TO GET THE ENG IGNITION ON AND A COUPLE MORE TO GET THE ENG ANTI ICE ON. I THEN HEARD THE ALTDEV HORN GO OFF; AND SAW WE WERE TURNED AND DSNDING AS WELL AS SLOWING. I TOLD THE CAPT WE WERE DSNDING. HE PUSHED THE PWR UP AND CLBED THE ACFT BACK TO FL210. WE WENT FROM FL210 TO FL204; FL203 AND BACK UP TO FL210. ATC CALLED FOR OUR ALT JUST AS WE LEVELED AT FL210. ABOUT THIS TIME WE POPPED OUT INTO CLR WX AND SMOOTH CONDITIONS. I PASSED ON TO ATC A PIREP ABOUT THE SEVERE TURB AND HVY ICING. WE CONTINUED ON TO MCO UNEVENTFULLY. WE WERE IN THE TURB WX FOR APPROX 30 SECONDS. ON LNDG AT MCO WE CALLED FOR SOME PARAMEDICS FOR A PAX BURNED BY SPILLED COFFEE DURING THE TURB. ALSO; I INSPECTED THE ACFT AFTER LNDG AND FOUND SOME MINOR DAMAGE TO THE RADOME. THE ACFT WAS THEN GNDED; INSPECTED AND REPAIRED.