Definition
A systematic method of moving the eyes across the flight instruments to gather the information needed to control the aircraft's attitude, performance, and navigation. The pattern emphasizes the primary instruments for the current flight condition while regularly checking supporting instruments to confirm and refine control inputs.
Plain English
The order and rhythm in which a pilot looks at each instrument so they pick up the right information at the right time, without fixating on any one gauge.
Context Anchor
Used in instrument flying, especially when the pilot must control the airplane by reference to the instruments instead of outside visual cues.
Derivation
Scan comes from the Latin scandere, meaning to climb or step. The sense of stepping across each item in turn carried into English as a way of describing the eyes moving methodically from one instrument to the next.
Why Pilots Care
A disciplined scan prevents fixation on a single instrument and ensures timely detection of attitude, heading, or altitude deviations before they become critical.
Intuition Check
Do not think of a scan pattern as simply looking at every instrument once. It means using a repeated, purposeful eye movement that keeps the whole aircraft picture updated.
Example Sentence 1
During the climb, the instructor reminded her to keep her scan pattern moving so she would catch any drift in heading or pitch.
Example Sentence 2
In straight-and-level flight the rectangular scan pattern helped the pilot notice small pitch changes before altitude began to drift.