What does the term “TDZE” refer to in aviation?

The term "TDZE" refers to "Touchdown Zone Elevation." This is a critical concept in aviation, especially for pilots when approaching a runway. The Touchdown Zone Elevation is the highest elevation in the first 3,000 feet of the runway, measured from the runway threshold. It is important for pilots to be aware of this elevation for several reasons, including understanding the terrain they may be landing on and ensuring they have adequate clearance from any obstacles.

Understanding the TDZE is essential for calculating descent profiles and approaches, as it helps pilots determine the minimum safe altitudes when approaching for landings. Additionally, it informs the aircraft's performance calculations for landing under various conditions, contributing to safer operations in varying environments. Knowledge of the TDZE is crucial when flying to ensure compliance with published approach and landing procedures, which take into account local terrain and obstacle requirements in the vicinity of the runway.