Gulfstream G100/G150 (IAI 1125 Astra)
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 30; Flight Crew Total 14500; Flight Crew Type 2700
Aircraft Equipment Problem Critical; Ground Event / Encounter Loss Of Aircraft Control; Ground Excursion Runway
General Maintenance Action
Aircraft
We came to land at ZZZ airport; executed ILS Runway XX to approach to it even the weather conditions where completely Visual. Everything was normal; we touched down and begun our landing roll; lowered the nose of the aircraft to the ground; deployed reverse thrust and applied brakes; suddenly master warning illuminated indicating a failure; I was not able to determine the source of the failure at that very moment; I have increased progressively the pressure on the brakes and reverse thrust; aircraft begin to decelerate rapidly and begin to veer slightly to the left side; condition I counteracted with differential braking and thrust reverse power reduction; reached for the steering wheel to continue counteracting the veering tendency and steering wheel was stiff and locked unable to move it; I mention to my First Officer we have lost steering control; continued counteracting with rudder pedal and differential braking; but rudder aerodynamic capability diminish with speed reduction; I mention again to my First Officer that we had lost steering control and felt diminish braking action; airplane slowly overrun into the grass to the left side and lost braking action; I went to and transfer to emergency braking and recover partial control of the aircraft finally stopping on the grass.Executed passenger evacuation checklist to secure aircraft; passengers and crew evacuated through main door; no injury occurred to any one onboard; airplane is in good condition; we called FSS to advise of our incident during landing.
G100 Captain reported on landing loss of brakes and steering resulted in runway excursion.