Date: 202009
Local time of day: 0001-0600
Location: ZZZ.Airport, US
Aircraft: A319
Operator: Air Carrier
Operating under: Part 121
Mission: Passenger
Flight phase: Takeoff / Launch
ATC / advisory: Tower ZZZ
Reporter organization: Air Carrier
Reporter function: Pilot Flying; Captain
Reporter qualification: Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Second reporter function: Pilot Not Flying; First Officer
Anomaly: Aircraft Equipment Problem Less Severe
Detector: Person Flight Crew
When detected: Other Takeof Roll
Result: Flight Crew Rejected Takeoff; Flight Crew Returned To Gate
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: Our duty day started at ZZZ Gate XXX with Aircraft X. This aircraft already had a maintenance issue with a radio altimeter RA1 fault. A few minutes after our scheduled departure time we were completely boarded and ready to go when [Maintenance Control] informed us this aircraft was grounded. ZZZ Maintenance concurred and informed us that we will have to deplane Aircraft X and go next door to Gate YYY and take Aircraft Y which was arriving in about 20 minutes. When we finally arrived at Aircraft Y; we noticed the inbound crew completely shut down this aircraft because they were not aware we were taking this aircraft to ZZZ1. We then completed our normal power-up; preflight and loading procedures. After push back and engine start up we got a FCU1 fault ECAM (Electronic Centralized Aircraft Monitor). I set the parking brake and we proceeded with the ECAM procedure with reference guidance described in our QRH . The ECAM procedure was successful and then we taxied to RWY XXL for our takeoff. During the initial part of our takeoff roll I was the Pilot Flying and I set takeoff power for a FLEX takeoff. My First Officer confirmed takeoff power was set. It was then that I noticed and felt a slight surging; and a tendency of the aircraft nose turning left. I immediately corrected the aircraft nose back to centerline using my rudders. It was then one second later that the aircraft nose abruptly went back to approximately 30 degrees left of centerline. I immediately initiated a low-speed Rejected Takeoff while bringing the aircraft nose back to centerline. I made my PA to tell our passengers to remain seated. I also briefly informed our passengers and crew what happened and why I elected In the interest of safety to discontinue our takeoff. We taxied the aircraft back to our new gate with no other incidents. After shutting down both engines and securing our aircraft we noticed In the E/WDU lower ECAM display in the class II messages that both ENG 1 FADEC (Full Authority Digital Engine Control) and ENG 2 FADEC were displayed in the lower right of the display...something I have never seen in my +XX years of flying the A320. ZZZ Maintenance noted this class II message and took the aircraft maintenance logbook with my RTO write up.


Second narrative: We were cleared for takeoff; set the power per SOPs and began the takeoff roll. Immediately the aircraft veered to the left. The Captain; as the Pilot Flying; corrected course and brought the aircraft back to center line. The takeoff continued normally until; what I would estimate; about 70 knots and then the aircraft veered even harder to the left and that is when the Captain rejected the takeoff. I don't really have an explanation as to why the event occurred. The power was set correctly and all engine indications showed stable thrust. When the aircraft veered to the left a second time; I thought it a good decision to reject the takeoff. I thought the decision to reject was a good one.


Synopsis: A319 flight crew report nose gear steering issue during takeoff roll.