What was found
AIRCRAFT WAS GNDED. AIR INTERRUPT, EMER DECLARED, LANDING UNEVENTFUL & ACFT WAS OVERWEIGHT. RECEIVED FALSE WINDSHEAR ALERT DURING TAKEOFF ROLL, AUTO THROTTLE DISCONNECTED DURING CLIMB, AUTO PILOT DISCONNECTED & CAPTAINS FLIGHT INSTRUMENTS BECAME UNRELIABLE. ACCOMPLISHED FLIGHT FAULT REVIEW & FOUND ALTITUDE FAILURE WITH AIR DATA COMPUTER NR 1. R & R NR 1 AIR DATA COMPUTER & ACCOMPLISHED CHECKS IAW AMM 34-16-001 & 22-001-05, SYS CHECKED NORMAL.