What was found
DURING APPROACH, IN ICING CONDITIONS AT 2500 FEET, THE AIRCRAFT EXPERIENCED VIOLENT ROLL. AP & AT DISCONNECTED AND EICAS MESSAGES WERE DISPLAYED AT FAIL, WIND SHEAR FAIL, STALL PROT FAIL, AND THE AOA LIMIT FAIL. AFTER LANDING, ADS PROBE 3+1 FAIL, DISPLAYED. REPLACED SMART PROBE IAW AMM 34-13-01.