GPWS always 'looks down', while EGPWS can 'look ahead'.

GPWS always 'looks down', while EGPWS can 'look ahead'.

• A. True
• B. False
• C. The statement is partially correct
• D. GPWS and EGPWS both look down only

Answer: (A)

The main idea here is how the two systems assess terrain hazards. Classic GPWS relies on data from the radar altimeter and the airplane’s current performance to determine how close you are to the ground or to rising terrain directly beneath you. It doesn’t have a terrain database or a flight-path model to predict what terrain lies ahead, so its warnings are essentially based on what’s directly below or very near the aircraft’s path. That’s why GPWS is described as “looking down.” Enhanced GPWS changes the game by adding a digital terrain database and using position, speed, and the planned flight path to evaluate terrain ahead along the route. This look-ahead capability lets the system warn about higher terrain that lies in front of you, not just what’s immediately beneath, hence it can “look ahead.” So the statement is accurate: GPWS mostly looks down, while EGPWS can look ahead.

The main idea here is how the two systems assess terrain hazards. Classic GPWS relies on data from the radar altimeter and the airplane’s current performance to determine how close you are to the ground or to rising terrain directly beneath you. It doesn’t have a terrain database or a flight-path model to predict what terrain lies ahead, so its warnings are essentially based on what’s directly below or very near the aircraft’s path. That’s why GPWS is described as “looking down.”

Enhanced GPWS changes the game by adding a digital terrain database and using position, speed, and the planned flight path to evaluate terrain ahead along the route. This look-ahead capability lets the system warn about higher terrain that lies in front of you, not just what’s immediately beneath, hence it can “look ahead.”

So the statement is accurate: GPWS mostly looks down, while EGPWS can look ahead.