Definition
A performance chart in the Pilot's Operating Handbook that shows the distance an aircraft will need to lift off and clear a 50-foot obstacle, based on inputs such as pressure altitude, outside air temperature, aircraft weight, wind, and runway slope. The pilot enters known values along the chart's reference lines and follows guide lines through correction factors to read the predicted takeoff distance.
Plain English
A chart that tells the pilot how much runway they will need to take off and climb over a 50-foot obstacle, given the day's conditions and the aircraft's weight.
Context Anchor
Seen in aircraft performance planning, especially in the Pilot’s Operating Handbook or performance section before departure.
Derivation
“Graph” comes from an older word meaning “to write” or “to draw.” In this term, it means a drawn chart that shows how takeoff distance changes when conditions such as weight, temperature, wind, or runway slope change.
Why Pilots Care
It lets the pilot verify that the available runway is long enough for a safe departure under the actual conditions.
Intuition Check
Do not assume “takeoff distance” always means only the distance while the wheels are on the runway. In many performance charts, it may mean the total distance needed to lift off and clear a 50-foot obstacle.
Example Sentence 1
Before departing from the high-altitude strip, the pilot used the takeoff distance graph to confirm the airplane could clear the trees at the end of the runway.
Example Sentence 2
With a ten-knot headwind entered on the takeoff distance graph, the required runway length shortened by several hundred feet.