In the landing configuration GPWS typically monitors the radio altimeter, air data computer, and instrument landing system.

In the landing configuration GPWS typically monitors the radio altimeter, air data computer, and instrument landing system.

• A. True
• B. False
• C. GPWS monitors only the radio altimeter
• D. GPWS monitors only the ILS

Answer: (A)

At landing, GPWS relies on three data streams to judge how close you are to the surface and whether your descent path is safe. The radio altimeter gives an actual height above the ground, which is essential for determining proximity to terrain and triggering warnings when you’re too low. The air data computer supplies speed, vertical speed, and altitude information, letting GPWS assess whether your descent rate and flight path are within safe limits as you approach the runway. The instrument landing system data provides runway guidance (glideslope and localizer) so GPWS can recognize that you’re on a legitimate approach path and avoid generating warnings for a normal ILS approach. Together, these inputs are typical for GPWS in the landing configuration, making the statement true.

At landing, GPWS relies on three data streams to judge how close you are to the surface and whether your descent path is safe. The radio altimeter gives an actual height above the ground, which is essential for determining proximity to terrain and triggering warnings when you’re too low. The air data computer supplies speed, vertical speed, and altitude information, letting GPWS assess whether your descent rate and flight path are within safe limits as you approach the runway. The instrument landing system data provides runway guidance (glideslope and localizer) so GPWS can recognize that you’re on a legitimate approach path and avoid generating warnings for a normal ILS approach. Together, these inputs are typical for GPWS in the landing configuration, making the statement true.