What was found
FLIGHT 8216 DURING TAKEOFF FROM CUR CREW REPORTED CAPTAIN'S AIRSPEED INDICATION SHOWED NO AIRSPEED INDICATION, THE F/O'S AIRSPEED INDICATOR WAS SHOWING 80 KNOTS, CREW ABORTED THE TAKEOFF AND RETURNED TO THE BLOCK WITHOUT ANY FURTHER INCIDENT. MAINTENANCE TROUBLESHOT CAPTAIN'S AIRSPEED INDICATION SYSTEM AND FOUND THE NR 1 ADC AT FAULT, THE NR 1 AIR DATA COMPUTER WAS REMOVED AND REPLACED IAW BOEING 727 MM CH 34-12-11, SYSTEM WAS OPERATIONALLY CHECKED IAW AMERIJET WORK CARD 816 AND 817, OPERATIONALLY CHECKED NORMAL. THE AIRCRAFT WAS RETURNED TO SERVICE.