Which airspeed limitation is not color-coded on airspeed indicators?

The airspeed limitation that is not color-coded on airspeed indicators is maneuvering speed. Maneuvering speed (Va) represents the maximum speed at which full deflection of the control surfaces can be applied without risking damage to the aircraft from excessive aerodynamic loads. It is a significant airspeed for pilots to know because it provides a margin of safety during turbulence and when performing abrupt maneuvers.

Unlike other airspeeds on the indicator, which are typically marked with specific color-coded arcs (such as red for never-exceed speed, yellow for caution, or green for normal operating range), maneuvering speed does not have a dedicated color arc. Instead, it is usually provided in the aircraft's pilot operating handbook (POH) or flight manual, where it can be cross-referenced. This reflects the concept that maneuvering speed is situational and can depend on aircraft weight, rather than being a fixed airspeed for operational limits that would necessitate a visual cue on the airspeed indicator.

In contrast, stall speed, maximum structural cruising speed, and never-exceed speed are all marked in color on the airspeed indicator, making them visually identifiable at a glance to assist pilots in maintaining safe operating conditions.