What was found
AIRCRAFT WAS GNDED. EMER DECLARED, LANDING UNEVENTFUL & ACFT NOT OVERWEIGHT. AT FL 330, IN ICING CONDITIONS, AUTOPILOT & AUTO THROTTLE DISCONNECTED, ACCOMPANIED BY TAIL BUFFET FROM ICE. TESTED AIRFOIL TAIL ICE PROTECTION SYS IAW AMM 30-10-00 WITH NO FAULTS DETECTED. TESTED 1 & 2 CENTRAL AIR DATA COMPUTER & RECEIVED 1 & 2 CADC COMPARE FAILED. R & R NR 2 CADC IAW MM 34-16-01. SYS TESTED NORMALLY.