As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/LGA - FLT 6500 - DURING TAKEOFF AT 0650 HOURS ON 8-4-97, ABORTED TAKEOFF DUE TO NR 1 ADC FAILED. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED NR 1 ADC, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)