The anti skid system is effective within what speed range?

• A. 5 kts to 100 kts
• B. 10 kts to 200 kts
• C. 50 kts to 150 kts
• D. 0 kts to 60 kts

Answer: (B)

Anti-skid systems protect tire integrity by measuring wheel speeds and modulating brake pressure to prevent the wheels from locking up during braking on the ground. They’re designed to work when the aircraft is on the runway and the wheels are turning within a typical ground-operations speed window. That window is roughly from 10 knots up to about 200 knots, which covers normal landing roll and aborted-takeoff scenarios where braking is active but the wheels still have meaningful rotation for slip detection.

Below about 10 knots, there isn’t enough wheel rotation for the system to detect and control slip effectively, so anti-skid isn’t needed in the same way. Above about 200 knots, the braking dynamics on the ground are outside the system’s calibrated range, so the anti-skid modulation isn’t intended to operate. Therefore, the speed range from about 10 to 200 knots is the best description of when anti-skid is effective.