What does anti-skid provide?

• A. Increases brake pressure on the slower wheel
• B. Reduces wheel brake pressure to recover wheel speed and prevent tire skidding (inop < 10 kts)
• C. Maintains fixed braking pressure
• D. Reverses brake pressure

Answer: (B)

Anti-skid modulates brake pressure to prevent wheel lock and tire skid. It constantly monitors each wheel’s speed and, if a wheel starts to slow too quickly or approach lock, it quickly reduces the brake pressure on that wheel. This lets the tire regain rotation and grip, then pressure is reapplied to maintain braking without letting the tire skid. This dynamic adjustment keeps the aircraft directional control and shortens stopping distance on slippery surfaces. Some systems may be inoperative at very low speeds because there isn’t enough wheel slip to measure effectively, but the principle remains: reduce pressure to recover wheel speed and prevent skid.

Increasing pressure on a slowing wheel would encourage lock, fixed pressure ignores changing wheel speed, and reversing brake pressure isn’t how this system operates.