Definition
Two rows of transverse light bars set into the runway surface on either side of the runway centerline, beginning 100 feet beyond the landing threshold and extending 3,000 feet down the runway, or to the midpoint of the runway, whichever is less. Touchdown Zone Lighting is installed on precision instrument runways to provide visual cues identifying the area where the aircraft should make contact with the runway during landing.
Plain English
A pattern of white lights built into the first portion of the runway, marking the area where the aircraft should touch down. The lights run along both sides of the centerline, starting just past the start of the runway and continuing for up to 3,000 feet.
Context Anchor
Seen at certain lighted runways, especially runways used for instrument approaches or lower-visibility landings.
Derivation
“Touchdown” in aviation means the moment the airplane’s wheels first touch the runway. “Zone” means an area. The phrase points to lights that mark the landing-contact area, not one exact spot.
Why Pilots Care
Provides precise visual cues for height and alignment at the critical moment of touchdown, reducing the chance of landing too far down the runway or drifting off centerline.
Intuition Check
Touchdown Zone Lighting does not mark one exact point where every airplane must land. It marks the runway area where landing airplanes normally make first contact.
Example Sentence 1
Breaking out of the clouds on the ILS, the captain confirmed the touchdown zone lighting in sight before continuing the approach below decision altitude.
Example Sentence 2
At night the touchdown zone lighting helped confirm the correct aiming point on the wet runway.