What was found
INSPECTION TYPE:N/A ON DESCENT, IMC CONDITIONS ENCOUNTERED. AT FL 240, RECEIVED AN INTERMITTENT "AMBER" ALERT ON BOTH PFDS. ANTI-ICE WAS THEN SELECTED. AFTER ABOUT 2 MINS THE AMBER IAS ALERT ON BOTH PFDS RETURNED. SEL ELEVATOR FEEL MANUAL ILLUMINATED. EMERGENCY DECLARED. RAN THE LOSS OF AIRSPEED SUSPECTED CHECKLIST. CADC NR 2 SELECTED ON CAPTS SIDE AND REGAINED CORRECT AIRSPEED FOR BOTH SIDES AND REGAINED USE OF AUTOPILOT. REF FRM FIM 34-16-00-1 STATIC PORT HEAT INOP REPLACED MSC. REF AMM 31-42-01-4, REPLACED NR 1 DEU REF AMM 31-61-02- 4, COMPLETE CADC ADJ TEST OF BOTH CADC SYS REF AMM 34-16-01-5.