B737-800
Flight Crew Air Transport Pilot (ATP)
Ground Event / Encounter Other / Unknown
Flight Crew Rejected Takeoff; Flight Crew Returned To Gate
Aircraft; Weather
Weight approximately 141.0; Flap 1; 22K Max [thrust set] (adjusted to max due to gusty winds and landing aircraft reporting a 20 knot gain at 300 feet).During [takeoff] roll the aircraft experienced a sudden; significant and uncommanded yaw to the right. Initiated reject procedure at approximately 140 knots. Asked for Fire and Rescue to look over the aircraft. They noticed nothing unusual; brakes were not overheating; taxied to the gate.
Just above 140 knots we experienced a sudden lunge to the right. Captain elected to reject the takeoff. The abort was handled professionally with all SOPs adhered to. Emergency crews were called to look our airplane over and after the fire chief said the brakes of the airplane was 160 degrees we taxied back to the gate with the emergency crews following us. I don't know why this event occurred but the winds were gusting with aircraft landing reporting 20 knot gain on approach.
B737-800 flight crew reported rejecting the takeoff at 140 knots after experiencing a sudden uncommanded yaw.