As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6267 - IAD-BTV - DURING CRUISE, AIRCRAFT MADE AN UNSCHEDULED LANDING AT IAD DUE TO BOTH ASI INOP. AIRCRAFT WENT OT GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTION AND REMOVED AND REPLACED DADC. OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)