Under what condition is the antiskid protection deactivated?

Antiskid protection is an important system in aircraft that helps prevent wheel skidding during landing and provides optimal braking performance. In many regional jets, including the Embraer Regional Jet, the antiskid system is deactivated when the aircraft is traveling at low speeds to prevent unnecessary activation and potential system error.

The correct condition for deactivating antiskid protection is typically set below 10 knots. This deactivation is crucial because at such low speeds, the risk of skidding is significantly reduced, and maintaining antiskid operation can lead to unwanted brake behavior. Therefore, once the aircraft decelerates below this threshold, the system can be safely turned off without compromising safety.

The other options suggest different speed thresholds, but 10 knots is generally established as a standard limit where the antiskid system should deactivate, aligning with safety protocols and optimal system performance during taxi operations and low-speed ground handling.