Ground Proximity Warning Computer

Ground Proximity Warning Computers (GPWC) are a type of electronic system used in aircraft to provide warnings and alerts to the flight crew regarding the aircraft's proximity to the ground. They are part of the supply class Aircraft Alarm And Signal Systems, which falls under the supply group Alarm, Signal And Security Detection Systems.

The GPWC continuously monitors various parameters, such as altitude, vertical speed, and aircraft configuration, to determine the aircraft's proximity to the ground. It uses this information to calculate the aircraft's position relative to the terrain and provides timely warnings to the flight crew if it detects a potential collision with the ground.

These warnings can include visual and auditory alerts, such as "Terrain, Terrain, Pull Up" or "Sink Rate, Pull Up." The GPWC helps pilots avoid controlled flight into terrain (CFIT) accidents by providing them with crucial information about their aircraft's proximity to the ground, especially during critical phases of flight, such as takeoff, landing, and low-altitude maneuvering.

In addition to providing warnings, GPWCs may also have other features, such as terrain mapping displays, which provide a visual representation of the surrounding terrain on the aircraft's cockpit displays. This allows pilots to have a better situational awareness of their surroundings and make informed decisions to avoid potential hazards.

Overall, Ground Proximity Warning Computers are essential components of aircraft alarm and signal systems, helping to enhance flight safety by providing timely warnings and alerts to the flight crew regarding the aircraft's proximity to the ground.