Below what taxi speed do anti-skid systems not function?

• A. 0-5 knots
• B. 10-15 knots
• C. 20-25 knots
• D. 30-40 knots

Answer: (B)

Anti-skid braking relies on accurate wheel-speed data to modulate brake pressure and prevent wheel lock. On the ground, there’s a minimum speed at which those speed sensors can provide reliable skid information. If the aircraft is taxiing slower than about ten to fifteen knots, the wheel speeds are too low and readings can be unreliable, so the anti-skid system is not active. Once you’re above that roughly 10–15 knot range, the system can monitor slip and automatically reduce brake pressure to prevent skidding. That’s why the correct choice is the range indicating speeds below which anti-skid isn’t functional.