In the airspeed indicator, what does the yellow arc signify?

The yellow arc on an airspeed indicator indicates the caution range of airspeeds, specifically between 111 and 149 KIAS (Knots Indicated Airspeed). This range serves as a warning to pilots that they are flying in a speed zone where caution is advised. Operating in this range may lead to conditions that could compromise safety, such as potential for stalling or loss of control if further disturbed. Understanding and adhering to these ranges are critical for safe flight operations, as they help pilots recognize airspeed limitations and avoid overspeed conditions. The specific values of the yellow arc are integral for maintaining appropriate airspeeds during different phases of flight, especially with respect to maneuvering and approach profiles.