Challenger 300 flight crew reported a failure of the nose wheel steering system; and loss of aircraft control after landing; which required being towed to the parking spot.
Synopsis
Challenger 300 flight crew reported a failure of the nose wheel steering system; and loss of aircraft control after landing; which required being towed to the parking spot.
Narrative
After an hour flight from ZZZ we have touched down on Runway XX at ZZZ1. Approach and landing were uneventful and maximum TR had been used after the mains touched down . SIC was PF and PIC was PM. At 80 KTS a positive exchange of flight controls has been maid (as briefed) and the PIC assumed control over the aircraft for the remainder of the flight. at roughly 60 KTS the airplane has started an uncommented turn to the left. the rate of turn rapidly increased. The PIC tried to assume control over the turn of the aircraft using the Tiller but without any success to rectify the movement; therefore he used the rudder paddles and differential breaking to gain some turn authority and to bring the airplane to a quick stop. the airplane came to a complete stop on the Runway facing to the West (90 degrees left of the Runway heading) and roughly 5 FT from the edge of the Runway. An Amber CAS massage 'NWS FAIL' has populated on EICAS screen. SiC notified the Tower of the incident. Tower declared the Runway closed and send the airport operations and a tug to take us to the GA parking. Visual inspection was made and confirmed that the NW is turned about 90 degrees to the left. Customs has been cleared and pax moved to the FBO to wait for a recovery aircraft to take them to their final destination ZZZ2.
Second reporter narrative
After landing in ZZZ1 on Runway XX; the FO handed control of airplane back to PIC. While transitioning to tiller steering at low speed of less than approximately 30 knot; the NWS FAIL amber message annunciated and the aircraft began a turn to the left; which prompted continuous braking action to stop the aircraft from leaving the pavement. Tower was alerted of the situation. Action appropriate to the situation and failure was taken. After coming to a stop the cabin and passengers were surveyed for damage and injury; of which there was none. Subsequently the FBO and Tower were alerted that a tow to the FBO was needed. This was performed with no further circumstances; after taking some time to attach the appropriate tow bar.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.