TDZE stands for?

• A. Threshold Crossing Elevation Zone
• B. Threshold Elevation Zone
• C. Touchdown Zone Elevation
• D. Takeoff Destination Elevation

Answer: (C)

TDZE stands for Touchdown Zone Elevation. This is the elevation, in feet above mean sea level, of the touchdown zone on a runway—the first 3,000 feet from the threshold where landing aircraft aim to touch down. Pilots use this value for landing performance planning and obstacle clearance considerations, since it tells you the actual surface height you’ll encounter in the area where you’re expected to touch down. It differs from the threshold elevation, which is simply the height of the threshold point itself; if a runway is sloped, the touchdown zone elevation can be higher or lower than the threshold elevation. The remaining options aren’t standard terms used on aviation charts.