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Coloured arcs around an airspeed dial.
Also known as: Airspeed arcs, ASI markings, Green arc, Coloured bands on a speed dial
The coloured arcs on an airspeed dial encode operating limits: white for flap operating range, green for normal operation, yellow for caution in smooth air only, and a red radial line for never-exceed. The arcs are specific to the individual aircraft type.
Denote operating speed ranges marked as coloured arcs around an airspeed indicator's scale.
Contexts: Vehicle dashboard
Assign white to the flap operating range, green to normal operating speeds, yellow to a caution range permitted only in smooth air, and a red radial line to the never-exceed speed.
Contexts: Vehicle dashboard
Are specific to the aircraft type and sometimes to the individual aircraft, so an instrument cannot simply be moved between airframes.
Contexts: Vehicle dashboard
A circular airspeed dial with concentric coloured arcs — white innermost over the lower range, green over the middle, yellow over the upper — and a single red radial line at the top of the yellow arc.