Anti-skid activation speed is which of the following values?

• A. 5 kts
• B. 10 kts
• C. 15 kts
• D. 20 kts

Answer: (B)

Anti-skid activation speed is the ground speed at which the wheel anti-skid system starts to intervene in braking. This threshold is chosen so the system can reliably detect wheel slip and modulate brake pressure during the critical early part of the braking roll when tires are most at risk of skidding.

Ten knots is the value used here because it’s high enough for wheel-speed sensors to have a clear, stable signal and low enough to provide protection during the important initial deceleration after touchdown or when braking on the ground. If you brake only below this speed, anti-skid isn’t needed and can cause unnecessary pulsations; if the threshold were higher, the system wouldn’t protect you early enough to prevent wheel lock during the important early part of the stop.