Definition
The total length of runway available for the takeoff run, plus the length of any clearway beyond the end of that runway. It is the total horizontal distance an aircraft is permitted to use to become airborne and reach a specified screen height above the surface.
Plain English
The full distance an aircraft has to lift off and climb to a safe height — including the runway itself plus any open, obstacle-free area immediately beyond it.
Context Anchor
Seen in airport data, runway declared distances, and takeoff performance planning.
Derivation
A clearway is an area beyond the runway, free of obstacles, that an aircraft can fly over while still climbing to its initial screen height. Adding it to the runway length gives a longer usable distance for takeoff than the runway alone — hence Takeoff Distance Available.
Why Pilots Care
It determines whether the airplane can reach rotation speed and clear obstacles with the planned takeoff weight and conditions.
Intuition Check
Do not assume Takeoff Distance Available is always the same as paved runway length. It can be longer than the runway if an approved clearway is published, and it is the declared distance you are allowed to use for performance planning.
Example Sentence 1
Before takeoff, the crew checked the airport chart and confirmed the Takeoff Distance Available exceeded the figure required by their performance calculations.
Example Sentence 2
A displaced threshold reduced the takeoff distance available for the departing aircraft.