B777-200
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe; Ground Event / Encounter Loss Of Aircraft Control
Flight Crew Rejected Takeoff; Flight Crew Returned To Gate
Aircraft
During initial takeoff roll; at takeoff thrust setting and less than 30 kts; aircraft began uncommanded hard left turn. Initiated slow speed reject; tried to counter with full right rudder and full right nose wheel steering. Tiller was binding; only 10 degrees of travel available as if fighting left tiller inputs. Continued manual braking to a full stop with the aircraft nose close to 45 degrees left of centerline with the aircraft fully blocking taxiway. We informed Tower of the rejected takeoff and that we required a tow back to the ramp. Suspected nose wheel steering malfunction
B777 Captain reported rejecting the takeoff and returning to the gate when the aircraft initiated a hard left turn early in the takeoff roll.