What serves as the threshold for anti-skid activation during landing on the CRJ 200?

The threshold for anti-skid activation during landing on the CRJ 200 is when the aircraft's speed exceeds 30 knots. At this speed, the anti-skid system becomes active to help prevent wheel lockup during braking. This is a critical safety feature that ensures that the aircraft maintains optimum traction during landing roll and braking.

The activation of the anti-skid system at this threshold is designed to prevent excessive braking force that can lead to a loss of control. It allows the system to dynamically adjust braking efforts based on wheel speed and the braking demand, thereby enhancing the aircraft's controllability on the runway.

In contrast, the other options do not accurately describe the activation criteria for the anti-skid system. For example, while touchdown and initial roll at touchdown are critical phases during landing, they do not specify the speed requirement for anti-skid activation. Additionally, WOW (Weight On Wheels) being inactive would imply a condition that is not relevant to the speed criteria for anti-skid activation. Thus, the correct answer regarding the threshold for anti-skid activation is when the aircraft's speed exceeds 30 knots.