As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 10- RETURN TO FIELD - WHILE CLIMBING THROUGH APPROXIMATELY 4000 FT, LOST ADR1 (AIR DATA REFERENCE); ADR3 HAD BEEN PLACED ON MEL PRIOR TO DEPARTURE. CAPTAIN ALSO LOST PRIMARY FLIGHT DISPLAY AND NAVIGATION DISPLAY. AN EMERGENCY WAS DECLARED AND FIRST OFFICER LANDED THE AIRCRAFT WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE AIR DATA MODULE (19FP4) IAW MM 34-11-17.