What safety device is actuated by the compression and extension of a landing gear strut?

The safety device that is actuated by the compression and extension of a landing gear strut is the Ground Safety Switch. This switch plays a crucial role in ensuring that the landing gear is properly deployed and locked in place when the aircraft is on the ground. When the landing gear strut compresses due to the weight of the aircraft, the switch is activated, preventing accidental retraction of the landing gear while on the ground. Conversely, when the landing gear extends, the switch ensures that the landing gear is fully deployed before the aircraft can be operated.

In contrast, the Lift Detection Sensor is typically used to monitor the aircraft's lift parameters rather than the landing gear status. The Landing Gear Lock Mechanism is responsible for physically locking the landing gear in place but does not directly interact with the strut's compression or extension to provide safety feedback. Lastly, the Emergency Release Handle is primarily used for situations requiring the manual release of the landing gear, rather than being a device that responds to the normal operational movements of the landing gear struts. Overall, the Ground Safety Switch is essential for preventing unintentional gear retraction during ground operations, making it a vital safety feature.