Definition
The length of runway declared available and suitable for the ground run of an aircraft taking off. It begins at the start of the takeoff portion of the runway and ends at the point where the runway is no longer usable for the ground roll, which is normally the far end of the paved runway surface.
Plain English
The amount of runway you actually have to roll down before lifting off. It is the usable runway length for the ground portion of takeoff.
Context Anchor
Seen in runway performance planning, airport data, and declared-distance information for runways.
Why Pilots Care
It determines whether the aircraft can reach rotation speed and become airborne before running out of pavement.
Intuition Check
“Available” does not simply mean all the pavement you can see. Here it means the runway distance officially made available for the takeoff ground roll; extra pavement or clear area may not count for this number.
Example Sentence 1
Before departure, the pilot checked the airport diagram and confirmed the takeoff run available was sufficient for the loaded aircraft on a hot day.
Example Sentence 2
With a shorter takeoff run available on runway 27, the crew reduced fuel to meet performance limits.