What happens when the aircraft is flown in the yellow arc?

When an aircraft is flown in the yellow arc of the airspeed indicator, it signifies the caution range of operation. This portion of the airspeed indicator indicates that while it might be possible to operate within this range, there are certain dangers involved, such as increased control responsiveness and the potential for abrupt stall characteristics. Pilots are trained to avoid prolonged operations in this range, as it may lead to situations that could compromise safety.

The yellow arc is between the green arc, which denotes safe operating speeds, and the red radial line which indicates the maximum safe speed. Operating in the yellow arc suggests that a performance penalty may exist, thus it serves as a warning to pilots to exercise caution in managing their airspeed to maintain safe flight. This understanding is crucial for making informed decisions during various phases of flight.