On the ground with gear down and anti-skid ON, anti-skid protection is active under which condition?

• A. It operates only when the airplane is on the ground and the gear is down and locked with anti-skid ON
• B. It operates only in flight
• C. It never operates
• D. It operates when the landing gear doors are closed

Answer: (C)

Anti-skid protection works by modulating brake pressure to prevent tire skid, using wheel speed data to detect slip. In this Beechjet 400A CTSys scenario, when the airplane is on the ground with the gear down, the anti-skid logic is not active. The system in this ground condition is not simulated to provide anti-skid protection, even if the anti-skid switch is ON. So there isn’t a ground condition under which anti-skid protection engages in this setup, making it effectively never operate in this specific context. The other possibilities assume activity based on flight or other gear states, but those aren’t how this CTSys configuration behaves in the ground scenario.