As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - FLT 1854 - AFTER TAKEOFF FROM PHL, CREW NOTED A SPLIT BETWEEN THE CAPTAINS AND FIRST OFFICERS ALTITUDE AND AIRSPEED, AND THE E/M'S 'RUDDER RATION' AND 'AILERON LOCKOUT.' FLIGHT RETURNED TO PHL AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE NR 2 AIR DATA COMPUTER. (M)