Citation X (C750)
Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 108; Flight Crew Total 9100; Flight Crew Type 346
Situational Awareness
Ground Event / Encounter Loss Of Aircraft Control; Ground Event / Encounter Object; Ground Excursion Runway
Flight Crew Regained Aircraft Control
Aircraft; Human Factors
VMC Visual approach into ZZZ. I was Non-flying Pilot. PIC was on stable approach; fully configured on VASI [Visual Approach Slope Indicator] to Runway XX. Landed at ref speed in touchdown zone. Runway bare and dry. OAT -20C. No wind. After touchdown on centerline; aircraft veered hard right. Captain corrected immediately and it veered hard left departing runway at approximately 60 knots. Nose gear contacted a runway sign after departure from paved surface. After stopping; taxied back onto runway and to ramp without further issue. No eye witnesses and no other traffic in the area.
Citation First Officer reported a loss of control on landing resulted in a runway excursion and contact with a runaway sign.