Which landing gear have weight-on-wheels proximity sensors?

Weight-on-wheels proximity sensors are utilized to detect whether the aircraft is on the ground or airborne, a critical function for various systems, including those related to the landing gear and autopilot operations. These sensors are typically installed not just on the nose gear but also on both main gears.

When the aircraft lands, the sensors activate when weight is applied, signaling systems to switch from flying mode to ground mode, allowing safe operation during landing roll, taxiing, and other ground operations. This configuration ensures that the entire landing gear system is monitored effectively, providing comprehensive data about the aircraft's status on the runway.

Thus, the presence of sensors on both the nose gear and the main gears enables the aircraft systems to make informed decisions based on whether the aircraft is on the ground or in flight, ensuring safe and efficient operation.