ATPL Airframe Practice Test

In modern anti-skid systems, the primary inputs are essential for managing the braking process and preventing wheel lock-up during landing and ground operations. The combination of idle wheel speed, braked wheel speed, and brake temperature allows the system to optimize braking performance effectively.

Idle wheel speed refers to the speed of the wheel when it is not under braking force. Monitoring this helps the system understand the wheel's natural state and how it behaves when brakes are applied. Braked wheel speed is the actual speed of the wheel when brakes are engaged, and comparing it to the idle speed aids in detecting any potential slipping or lock-up situation. Brake temperature is crucial since high temperatures can affect brake performance and the risk of fading or structural failure.

Using all three inputs gives the anti-skid system a comprehensive view of the braking dynamics, enabling it to make real-time adjustments to maintain optimal braking without causing wheel lock-up. This holistic approach is what differentiates the correct answer from the other options, which may combine fewer inputs and thus would not provide the same level of control or safety.