A B717 veered sharply left at approximately 60 kts after takeoff thrust was set. The Captain rejected the takeoff and returned to the gate.
Synopsis
A B717 veered sharply left at approximately 60 kts after takeoff thrust was set. The Captain rejected the takeoff and returned to the gate.
Narrative
All flight activities for a departure on Runway XXR were normal up until the takeoff roll. At approximately 60 KIAS when the First Officer called 'Thrust Normal'; the aircraft veered sharply left and departed the center line of the runway by 10-15 feet. I did not feel any control inputs on the rudder or other flight controls. I did not hear or see any abnormal engine or system indications. The First Officer stated that all engine parameters were normal. As Pilot Flying; I corrected back to centerline using rudder pedal; nosewheel steering. The pedal forces seemed higher than normal to steer the aircraft to the right. It felt as if the aircraft continued to want to veer to the left. At that point; I aborted the takeoff. Airspeed was approximately 75 KIAS. We taxied off the runway; stopped the aircraft; briefed the passengers and called Operations and was assigned a gate. All taxi operations were normal; with no abnormal control feel or actions. We called the Tower ATC and asked whether or not there were any wind gusts at the time of our takeoff. The controller stated the wind was 280 at 7 knots. After engine shutdown at the gate; I entered the discrepancy into the Maintenance Log Book and debriefed the Dispatcher and Maintenance Controller. I conducted a walk -around of the aircraft at the gate. There was no unusual indications of a tire or brake problem. No flight controls appeared out of position. At the time the crew left the aircraft; maintenance technicians were still evaluating the aircraft.
NASA callback
The reporter stated that maintenance did not find any obvious cause for the steering problem. In his many years flying the DC-9; MD-80 and now the B-717 he has never felt this type of steering problem. Maintenance did change both nose wheels; check the main wheels and found nothing obvious that could contribute to the this anomaly. A Mechanic did state that a possible cause was the failure of one of the nose wheel steering control valves to fully engage after the nose wheeling steering pin was removed. A single control valve engaged would permit nose wheel steering engagement for normal operations but may not allow full control of the nose wheel steering when needed; such as during takeoff with power application.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.