What does the yellow arc on an airspeed indicator indicate?

The yellow arc on an airspeed indicator represents the caution range. This range indicates speeds that require special attention and caution while flying. Operating within this range may be permissible, but it is important for pilots to be aware that flying in this zone can increase the risk of stall or other undesirable flight characteristics, especially if abrupt control inputs are made.

Understanding the significance of the yellow arc is crucial for maintaining safety and demonstrating good decision-making in flight operations. The airspeed indicator provides essential information for maneuvering and understanding the aircraft's performance envelope. Being aware of the caution range allows pilots to avoid situations that could lead to dangerous conditions inadvertently.

The other options denote various aspects of airspeed operation. The normal operating range is shown in green, where the aircraft can be safely flown without concern. The flap operating range is typically indicated by a white arc, which specifies speeds for safe flap operation. The never exceed speed is marked by a red radial line on the airspeed indicator, denoting the maximum speed that should never be surpassed to prevent structural damage to the aircraft.