What does a yellow arc on the airspeed indicator signify?

The yellow arc on the airspeed indicator signifies the caution range. This range indicates speeds that require special attention and caution during flight operations. It is important for pilots to be aware of this range, as flying within the yellow arc can lead to situations that may become unsafe if not monitored carefully.

Specifically, this caution range is intended to alert the pilot to avoid operating within these speeds unless absolutely necessary, such as during certain types of maneuvers or emergency situations. Understanding the implications of flying in the yellow arc can help pilots maintain control of the aircraft and enhance safety during flight operations.