What was found
AFTER TAKEOFF FROM TAIPEI, DURING AIRCRAFT CLIMBING, CAPTAIN REPORT FIRST OBSERVOIR'S AIRSPEED INDICATION AND ALTITUDE INDICATION BLANK, CAPTAIN REQUEST AIR RETURN. ON GROUND CHECK FOUND NR 2 AIR DATA COMPUTER INOPERATIVE, AFTER REPLACED COMPUTER AND PERFORM PITOT-STATIC TEST, SYSTEM BACK TO NORMAL.