AN A320'S L LNDG GEAR CTL INTERFACE UNIT (LGCIU) FAILED ON DEP. THE CREW DECLARED AN EMER AND RETURNED TO LAND.

Narrative

DURING INITIAL CLBOUT; FO (WHO WAS FLYING) NOTICED THE SIDE STICK ORDER INDICATION SYMBOL DISPLAYED. (NORMALLY DISPLAYED ONLY ON THE GND.) ABOUT THE SAME TIME; THE CAPT MENTIONED HIS FLT DIRECTOR WAS COMMANDING A DIFFERENT PITCH COMMAND THAN THE FO'S (THE CAPT'S FLT DIRECTOR WAS INCORRECT; THE FO'S SHOWED THE CORRECT COMMAND.) ALSO; THE FO NOTICED VLS WAS NOT DISPLAYED ON THE PFD. AT 1500 FT MSL; THE ECAM MASTER CAUTION 'ANTI-ICE CAPT PITOT' WAS DISPLAYED; THEN THE ECAM 'ENG #2 REVERSER FAULT' ALSO WAS DISPLAYED. THE FO FLEW THE AIRPLANE WHILE THE CAPT RAN THE ECAM'S. WE CLBED TO 15000 FT AND ENTERED HOLDING AT ZZZ2. THE CAPT CALLED DISPATCH AND MAINT. THE CAPT RECOVERED CORRECT FLT DIRECTOR INDICATIONS AND COMPLETED THE ECAM BY SWITCHING AIR DATA NORM TO 'CAPT 3.' THE FO STILL HAD THE STICK ORDER INDICATION SYMBOL DISPLAYED INDICATING THAT THE ACFT WAS STILL PARTIALLY IN GND MODE. 'ENG #2 REVERSER FAULT' WAS DISPLAYED ON THE STATUS PAGE. THE CREW DECLARED AN EMER DUE TO MULTIPLE GND/MODE PROBS AND RETURNED TO ZZZ LNDG ON RWY 28L AFTER RUNNING APPLICABLE CHKLISTS; INCLUDING THE OVERWT LNDG CHKLIST. A NORMAL APCH WAS FOLLOWED BY A NORMAL LNDG. MAINT REPLACED THE LNDG GEAR CTL INTERFACE UNIT'S SENSOR ON THE L MAIN GEAR.