Definition
The highest elevation, in feet above mean sea level (MSL), of any point in the first 3,000 feet of the runway, beginning at the approach end. It is published on instrument approach charts and is the reference elevation used for decision height (DH) on a precision approach.
Plain English
The height above sea level of the highest spot in the first 3,000 feet of the runway where you'll actually land. It's the number an approach uses as the 'ground level' for that runway.
Context Anchor
Seen on instrument approach charts and in glideslope discussions, where the vertical path and landing minimums are tied to a specific runway height.
Derivation
“Elevation” comes from a word meaning “to raise.” In aviation, it means height above mean sea level. “Touchdown zone” points to the runway area where landing aircraft normally first contact the runway.
Why Pilots Care
It establishes the correct vertical path the aircraft must follow to reach the runway at the proper point and height.
Grounding Statement
Picture the first 3,000 feet of the landing runway: the runway touchdown zone elevation is the height above sea level of the highest spot in that area.
Intuition Check
Do not read this as the exact height where your wheels will touch down. It is a surveyed runway reference: the highest point in the first 3,000 feet of the landing runway, measured above sea level.
Example Sentence 1
The approach plate showed a TDZE of 412 feet, so the pilot set decision height accordingly before starting the approach.
Example Sentence 2
With the touchdown zone elevation known, the crew could calculate the exact altitude to cross the final approach fix.