BD700 flight crew reported a loss of nose wheel steering after landing during the rollout. The aircraft departed the runway and stopped on the adjacent hard pavement. After cycling the steering switch; steering control was regained and the jet taxied under its own power to the ramp.
Synopsis
BD700 flight crew reported a loss of nose wheel steering after landing during the rollout. The aircraft departed the runway and stopped on the adjacent hard pavement. After cycling the steering switch; steering control was regained and the jet taxied under its own power to the ramp.
Narrative
A Bombardier Global Express; operating as Aircraft X; experienced a runway departure following landing on Runway XX at ZZZ. Runway XY was in use. Runway XX was requested and approved; due to winds favoring Runway XX. Meteorological conditions [were] winds 340 at 11 kt.; visibility 10 nautical miles; no ceiling/cloud cover. Aircraft touched down and decelerated normally. Approaching Taxiway XX; the aircraft suddenly yawed to port as if the left main wheel brake had locked. Pilot flying attempted to arrest the left yaw with the nose wheel steering and differential braking using opposite rudder input; without success - then announced; I have no nose wheel steering." Pilot not flying applied right rudder and brake pressure to assist pilot flying in an attempt to turn the aircraft to starboard.Aircraft rolled off Runway XX to the west and onto the hard surface at slow speed; approximately 25 - 50 ft. before coming to a stop. The point of runway excursion was beyond Taxiway XY and just prior to Taxiway XX. Pilot flying cycled the Nose Wheel Steering Switch; resulting in control authority being restored. Aircraft returned to the runway under its own power and was cleared to taxi to the ramp without further incident.Post-flight inspection revealed no damage to the aircraft. Airport personnel reported NO damage sustained to airport lighting. Maintenance personnel are scheduled to inspect the aircraft on Day 0. Aircraft had recently completed a 240-month inspection with Maintenance. Operator's Maintenance Crew Chief; assigned to this specific aircraft; had advised the crew post-mishap that the nose wheel steering had failed during an engine run when the aircraft was with Maintenance. Date/time of this event; nose wheel steering failure in Maintenance; is unknown at this time."
Second reporter narrative
A Bombardier Global Express; operating as Aircraft X; experienced a runway excursion following landing on Runway XX at ZZZ. Runway XY was in use. Runway XX was requested and approved; due to winds favoring Runway XX. Meteorological conditions [were] winds 340 at 11 kt.; visibility 10 nautical miles; no ceiling/cloud cover. Aircraft touched down and decelerated normally. Approaching Taxiway XX; the aircraft suddenly yawed to port as if the left main wheel brake had locked. Pilot flying attempted to arrest the left yaw with the nose wheel steering and differential braking using opposite rudder input; without success - then announced; I have no nose wheel steering." Pilot not flying applied right rudder and brake pressure to assist pilot flying in an attempt to turn the aircraft to starboard. Aircraft rolled off Runway XX to the west; just prior to Taxiway XX and onto the hard surface at slow speed; approximately 35 ft. from the edge of the runway; farthest main gear position. The point of runway excursion was prior to Taxiway XX and just prior to Taxiway XY. Pilot flying cycled the Nose Wheel Steering Switch; resulting in control authority being restored. Aircraft returned to the runway under its own power and was cleared to taxi to the ramp without further incident. Total aircraft roll; from point of touchdown to the point the aircraft returned to runway centerline; is estimated to be 2500 ft. Post-flight inspection revealed NO damage to the aircraft. Airport personnel reported NO damage sustained to airport lighting/property. Maintenance personnel are scheduled to inspect the aircraft on Day 0. Aircraft had recently completed a 240-month inspection with Maintenance. Operator's Maintenance Crew Chief; assigned to this specific aircraft; had advised the crew post-mishap that the nose wheel steering had failed during an engine run when the aircraft was with Maintenance. Date/time of this event; nose wheel steering failure in Maintenance; is unknown at this time. Following the adverse yaw; pilot not flying assumed the pilot flying had control of the aircraft due to the slow speed. As a result; pilot not flying did not intervene with regard to control of the aircraft as the aircraft deviated from runway centerline to port; western edge of Runway XX. Pilot not flying did; however; intervene to assist the pilot flying once the announcement of 'I have no nose wheel steering' was made. This delay in action may have contributed to the runway excursion. The pilot not flying was not aware of the level of brake application by the pilot flying during the sequence of events; but did apply differential braking as the aircraft approached the runway edge. Pilot flying stated he exercised "full brake application" following the event."
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.