A319
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Troubleshooting; Communication Breakdown; Time Pressure; Workload
Aircraft Equipment Problem Critical
Air Traffic Control Provided Assistance; Flight Crew Landed As Precaution; Flight Crew Requested ATC Assistance / Clarification; General Maintenance Action
Aircraft; Procedure; Human Factors
On descent into ZZZ we received an ECAM for a FCU (Flight Control Unit) 1 failure. Completed ECAM procedure and went to QRH which advised to reset circuit breakers. I decided not to reset since we were on arrival; busy environment and in high traffic area. Plane was flying normal with FCU 2. Approximately 5 mins later we had FCU 2 failure.  Accomplished ECAM procedure for dual FCU failure and we're able to recover one FCU.  We were on descent with crossings and speeds to meet. When this happened we called controller to advise with no response because he was very busy; after three [urgent request] calls we were given a different frequency. Controller gave us a heading. We were able to recover one FCU as stated above. Uneventful landing; logbook entry made and this report filed.
Captain reported multiple FCU failures on descent; but were able to recover one FCU. Captain stated ATC did not respond to multiple requests for help before giving them a different frequency to continue approach and landing.