Definition
The systematic, continuous visual sampling of flight instruments by which a pilot monitors aircraft attitude, performance, and navigation. An effective scan moves the eyes between instruments in a deliberate pattern, returning frequently to the primary attitude reference, so that no single instrument is fixated on and no instrument is neglected.
Plain English
It's the way a pilot keeps their eyes moving across the cockpit instruments, checking each one in turn so they always know what the aircraft is doing.
Context Anchor
Used in instrument flying and especially in turbulence, when the pilot must rely on the instrument panel instead of body sensations or outside visual references.
Derivation
From the older sense of 'scan' meaning to look over something carefully and methodically, point by point. In flying, it captures the idea of the eyes sweeping across the panel in a planned sequence rather than wandering randomly.
Why Pilots Care
A disciplined scan prevents loss of control by catching small deviations before they grow large, especially when turbulence makes the airplane feel unstable.
Intuition Check
Scan does not mean one quick look across the panel. Here it means a repeated, organized check that keeps coming back to the important instruments.
Example Sentence 1
As the air grew rougher, she tightened her instrument scan, returning to the attitude indicator after every glance at altitude or heading.
Example Sentence 2
A good instrument scan starts with the attitude indicator and then moves to the airspeed and altimeter.