Gulfstream G650
Flight Crew Air Transport Pilot (ATP)
Fatigue
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Object; Inflight Event / Encounter Object
Flight Crew Became Reoriented; General Maintenance Action
Human Factors; Procedure
Aircraft was parked on ramp following a 10.9 hour flight. The PIC cleared customs with the passengers and returned to the aircraft to finish paperwork and prepare for a surface reposition to the FBO while SIC and Cabin Hostess cleared Customs. Upon our return; the door was closed and we began a normal engine start procedure. After start; PIC began taxiing by applying normal break-away thrust and then turning the nose-wheel to maneuver in a narrow ramp. Immediately after turning the nose-wheel; he noticed an unusual resistance on the tiller which was immediately followed by 'thump' sound and a 'Nose Wheel Steering Fail' CAS message. He immediately stopped the aircraft; shut down the engines; and exited the aircraft to investigate the situation. He then discovered that the nose-wheel had 'pushed' the small nose-wheel rubber chocks forward about 1 meter. When the nose-wheel was turned; the outboard nose-wheel 'lifted' onto the triangular chock and started to 'climb' the chock; resulting in an uncommanded nose- wheel deflection of approximately 90 degrees angle that exceeded limits. This exceedance triggered the red oversteer 'pop out' collar on the nose-wheel assembly.PIC immediately contacted Maintenance and the lead captain to explain the situation. In full cooperation with maintenance; he remained with the aircraft until an approved tow was arranged to a maintenance hangar. Assessment of aircraft condition determined that no aircraft damage occurred. Trip was completed with no equipment change.Suggest that a new SOP require that both pilots check wheel chock removal and/or 'final walk-around' prior to every aircraft ground movement.
Also the policy of having a 3 pilot crew if a flight is more than 10 hours should strictly be enforced. In this case we flew 10.9 hours with two pilots.
G650 flight crew starts up and attempts to taxi to the FBO. A bump is felt and a nose wheel steering fail CAS message appears. Nose chocks had been installed and caused the nose wheel steering to disconnect. Maintenance is called to reconnect the steering. Fatigue was cited as a factor in the incident.