Definition
Performance charts that present multiple variables on a single diagram, allowing the pilot to solve for an answer (such as takeoff or landing distance) in one continuous flow rather than reading several separate charts. The pilot enters the chart at a starting value, moves through reference lines for each variable (pressure altitude, temperature, weight, wind, obstacle height, etc.), and arrives at the final result.
Plain English
A single chart that does the work of several. You start at one edge with a known value, follow the lines through each correction (temperature, weight, wind, and so on), and read your answer off the other side.
Context Anchor
Seen in performance chart work, especially when a pilot is using the Pilot’s Operating Handbook or Aircraft Flight Manual to plan takeoff, climb, or landing performance.
Derivation
Combined comes from a Latin idea meaning “joined together.” Graph comes from a Greek word meaning “to write or draw.” Together, the words point to a drawn chart where several pieces of information are joined into one usable picture.
Why Pilots Care
They give a fast, accurate runway-length requirement under real conditions without forcing the pilot to perform separate calculations for each variable.
Intuition Check
Do not assume combined graphs are just several separate graphs shown on the same page. In this context, a combined graph is one connected chart that must be followed in the proper order to get the correct result.
Example Sentence 1
Using the combined graph in the POH, the pilot worked from outside air temperature through pressure altitude, weight, and headwind to find the total takeoff distance over a 50-foot obstacle.
Example Sentence 2
Using the combined graphs, she confirmed that the added baggage would still allow a safe landing within the 3,000-foot runway.