A319 captain reported executing a go-around after the approach became unstabilized following multipl...

Narrative:

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. First officer 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. First officer 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.

Original NASA ASRS Text

Title: A319 Captain reported executing a go-around after the approach became unstabilized following multiple system failures; including autopilot; FMGC; and nav display.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1451123
Time
Date	201705
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	A319
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Component
Aircraft Component	Air Data Computer
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Speed All Types Inflight Event / Encounter Unstabilized Approach

A319 captain reported executing a go-around after the approach became unstabilized following multiple system failures; including autopilot; FMGC; and nav display.