Final answer:
The two WOW proximity sensors on an aircraft's nose gear detect when the plane is on the ground to control the landing gear and other ground-only systems. They ensure the safety and proper functioning of the aircraft during critical phases like takeoff and landing.
Step-by-step explanation:
The two WOW (Weight-On-Wheels) proximity sensors on the nose gear of an aircraft serve a critical safety and operational function. These sensors are responsible for detecting when the aircraft's nose gear is touching the ground, which is essential for deploying or retracting the landing gear at appropriate times. The information from the sensors is used by various aircraft systems to ensure that landing gear is only retracted when the aircraft is airborne and that it is deployed prior to landing. Additionally, these sensors play a role in enabling or disabling systems that should only be active when the aircraft is on the ground, like ground spoilers, thrust reversers, and certain types of brakes.
For example, during takeoff, the proximity sensors will signal that the aircraft has lifted off, leading the landing gear to be safely retracted. Conversely, during landing, the sensors confirm contact with the runway, signaling that it is safe to deploy ground operations. If these sensors malfunction, it could lead to unsafe situations such as an inadvertent retraction of the gear while still on the ground or the inability to extend the gear for landing. Therefore, the role of the two WOW proximity sensors is crucial for the safety and proper function of modern aircraft operations.