Definition
A single performance chart in the Pilot's Operating Handbook that calculates landing distance by combining several variables — pressure altitude, temperature, aircraft weight, headwind or tailwind component, and runway condition — onto one continuous graph. The pilot enters the chart with the current conditions and traces a path through each variable to read off the total landing distance and the ground roll required.
Plain English
One chart that lets you work out how much runway you'll need to land, taking all the conditions into account at once instead of using separate charts for each factor.
Context Anchor
Seen in the performance section of an aircraft handbook and in FAA landing chart discussions when deciding whether a runway is long enough for landing.
Derivation
Called "combined" because it merges the calculations that would otherwise require multiple separate tables or graphs into a single working chart.
Why Pilots Care
Allows pilots to verify that the available runway length exceeds the required landing distance under current conditions, preventing runway overruns.
Intuition Check
Do not read “combined” as meaning the chart gives one fixed landing distance for every situation. It means the chart combines several changing conditions so the pilot can find the distance for this landing.
Example Sentence 1
Before departure, she used the combined landing distance graph to confirm the destination runway was long enough at the forecast temperature and landing weight.
Example Sentence 2
Using the combined landing distance graph, the calculations showed an additional 800 feet were needed due to the higher landing weight.