A319
Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation - Speed All Types; Inflight Event / Encounter Unstabilized Approach
Flight Crew Became Reoriented; Flight Crew Executed Go Around / Missed Approach
Aircraft
Aircraft had Auto Pilot #1 inoperative; FMGC #1 failure; #1 Nav Display failure; and previously placarded GPWS failure upon arrival. First Officer was Pilot Flying and during visual approach managed airspeed bug and airspeed appeared abnormally high based on configuration and descent rate. FO elected to go-around in accordance with procedures due to unstable parameters at 1;000 AGL. Tower gave non-standard go around instructions and combined with Pilot Monitoring being distracted with a malfunctioning nav display; we received a momentary flap overspeed warning at Flaps 1. During subsequent approach with speed in managed setting; we again observed the airspeed to be abnormally high and at one point the airspeed command bug appeared to be in the Flap Overspeed limit although the actual airspeed was within flap limits. FO disconnected auto pilot and auto throttles and was able to obtain stable approach parameters by 1;000 AGL and land safely. I entered all malfunctions in the logbook and called [Maintenance] to discuss the issues after parking at the gate.
A319 Captain reported executing a go-around after the approach became unstabilized following multiple system failures; including autopilot; FMGC; and nav display.