A320
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 84.85; Flight Crew Total 24902; Flight Crew Type 9591
Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Weather / Turbulence
Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification; General Maintenance Action
Aircraft
Enroute ZZZ-ZZZ1 on the red-eye at FL 33;000 ft. into the flight we had an ANTI ICE STBY PITOT ECAM. QRH was used. later we were at FL 35;000 ft. and Autopilot 1 disconnected; I attempted to reengage #1 or #2 autopilots and neither would engage. The FMAs went blank on both the F/O and my PFDs. Autothrust disengaged and went into Thrust LK. Thrust levers were matched with power setting and IDP switches used. We had our route displayed in the ND on both sides and MCDUs were operating normally. ECAM displayed:AUTO FLT AP OFF (RED)AUTO FLT A/THR OFF (AMBER)L/G SHOCK ABSORBER FAULT (AMBER)Indications looked similar to an FMGC Dual Failure except we had both NDs displaying our route; our MCDUs did not go into a subsystem page and no FMGC (Timeout) was observed. The Shock Absorber Fault ECAM had me thinking this may be a different malfunction that I have never witnessed or a coincidence. We contacted Dispatch/Maintenance via phone patch using the 'CALL ME' function on ACARS. Maintenance was perplexed of what was causing our malfunction. They had us reset the Auto Flight C/B's B1 (MCDU 1) B2 (FMG 1) and hold. C/B's were reset with no change. We attempted the Long Reset in the QRH Dual FMGC Failure with no success. Mintenance had no other options available.ATC was advised of our equipment malfunction and our inability to remain in ZZZ airspace. We were cleared down to FL 27;000 ft.. Review of our fuel; weather and capabilities with my F/O. Dispatcher we agreed to continue to ZZZ1 with the caution that if we had additional malfunctions; we would consider ZZZ2 as a divert airport. ATC was given our new suffix with the inability to operate in RVSM airspace.Purser was informed of our status.Prior to touchdown at FL 27;000 ft. both FMAs began to populate. Autopilots and Autothrust became available. All malfunctions except for the STBY Pitot cleared. We reengaged the Auto flight functions and remained at FL 27;000 ft. We landed on Runway XX at ZZZ1. Malfunctions were recorded on in the ELB; including a information writeup of what happened. Technician met the plane and we explained what happened.
Captain reported failure of aircraft display systems; causing aircraft to descend out of RVSM airspace.