Touchdown Zone

Touchdown Zone is the first 3,000 feet (900 m) of runway beyond the threshold, or the first third of the runway — whichever is less. It is the area where the aircraft should make initial contact with the runway surface during a normal landing.

• Marked with touchdown zone markings (pairs of rectangular blocks) on precision approach runways
• Touchdown zone lights (TDZL): two rows of white lights embedded in the runway surface
• RVR transmissometers are positioned at the touchdown zone for RVR measurement
• Landing beyond the touchdown zone increases the risk of runway overrun