What was found
AIRCRAFT WAS GROUNDED: APPROXIMATELY 30 MINUTES PRIOR TO LANDING AUTO FLIGHT, #1 FLIGHT CONTROL UNIT (FCU) ECAM FAULT. QRH SYSTEM RESET OK BUT ONLY 5 MINUTES THEN FAULT RE-OCCURRED. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT LANDED AT DFW SAFELY WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED FLIGHT CONTROL UNIT (FCU) PER AMM 22-18-00. AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK WITH NO FAULTS NOTED.. TT 6460411