What was found
ATO - ON TAKEOFF ROLL AT APPROX 50 KTS FO SAW AIR SPD TAPE RED. STOPPED A/C ON RWY. RETURNED TO NORMAL. CMS SHOWED ADIRU 1 FAULT. PERFORMED TASK AND 3411-7002-HA2 AIRSPEED DISCREPANCY INCIDENTS. REMOVED AND REPLACED ADIRU#1 PER 34-12-34. REMOVED AND REPLACED #1 PITOT PROBE PER 34-11-15. PERFORMED TASK 34-11-00. LOW RANGE LEAK CHECK OF PRINCIPLE PNEUMATIC CIRCUITS AND FUNCTIONAL TEST OF THE ALTITUDE AND AIRSPEED DATA. TASK 34-13-00. ALL TESTS PASSED. NO FAULTS NOTED. OK FOR SERVICE.