How do weight on wheels (WOW) systems function?

Weight on wheels (WOW) systems play a crucial role in aircraft operations by sensing whether the aircraft's weight is resting on the main landing gear upon touchdown. This sensing capability allows the WOW system to activate various system functions related to the landing gear and aircraft systems, such as enabling anti-skid brakes, deploying thrust reversers, and disconnecting certain cockpit indications related to flight. By confirming that the weight of the aircraft is on the wheels, the system ensures that these functions only operate when appropriate, thereby enhancing safety and performance during ground operations.

The other choices do not accurately reflect the primary operation of WOW systems. While monitoring fuel efficiency, tire pressure, and calculating landing distances are important aspects of aircraft operations, they do not directly pertain to the specific function of WOW systems.