A321 flight crew reported a reported rejected takeoff due to the aircraft nose yawing to the left. The crew stated Maintenance found faults with the FMC 1 system which could have caused the issue.
Synopsis
A321 flight crew reported a reported rejected takeoff due to the aircraft nose yawing to the left. The crew stated Maintenance found faults with the FMC 1 system which could have caused the issue.
Narrative
We were cleared for takeoff on Runway XXR in ZZZ. The winds were approximately 200 degrees at 7 knots in VFR conditions with a dry runway. We were in Config 2 with flex power. Passing 80 knots; everything was normal. V1 was 149 and Vr was 156. At approximately 140 knots there was a sharp yawing of the aircraft nose to the left. The Captain rejected the takeoff and we both proceeded with the RTO (Rejected Takeoff) company procedures. We stopped the aircraft on the runway briefly and then exited to evaluate the situation. The brakes heated to approximately 625 degrees. We taxied the aircraft back to the gate in ZZZ where the Captain wrote up the discrepancy in the Aircraft Maintenance Log. Maintenance evaluated the aircraft and removed it from service. Maintenance found faults in the FMC 1 system which might have played a role in the yawing movement. The winds were light enough where it wouldn't have normally played a factor. The Captain suspected an engine failure with how sharp the movement was and made the decision to reject. The reject was at such a high speed with minimal to no time to evaluate the situation. Once the aircraft yawed left; the safest course of action was to reject.
Second reporter narrative
Held in position for crossing traffic. Began the takeoff and around 140kts I experienced a left yaw. I sensed the yaw in the rudder pedals and visually outside from the center line. I quickly returned the aircraft to the centerline and began the RTO (Rejected Takeoff) procedure. I don't remember if I called out 'my aircraft reject' but FO (First Officer) began performing as trained. He was excellent! I stopped the aircraft on the runway and made the required PA to the passengers. Evaluated the condition of the aircraft and taxied off the runway. Held on taxiway holding short to further evaluate and notified the company we needed to return to the gate. Made additional PA's to reassure passengers everything was fine. Began brake cooling and parked at [the] gate. Enter information into Aircraft Maintenance Log. Aircraft was taken out of service.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.