What feature is indicated by the caution range on the airspeed indicator?

The caution range on the airspeed indicator signifies the operating limitations of the aircraft. This range is designed to alert the pilot to speeds that may not be optimal for safe flight operations but are not immediately hazardous. It typically encompasses speeds that should be approached with caution, indicating that while flight is still possible, exceeding or falling below these speeds could lead to undesirable performance effects.

For instance, entering this range might mean the aircraft is approaching a stall or could be experiencing increased drag or other adverse performance. Understanding the operating limitations represented by the caution range aids pilots in making safe and informed decisions regarding their airspeed during various phases of flight.

While the normal speed range marks acceptable and safe flight operations, and the stalling speed area specifically indicates critical low-speed thresholds, the caution range serves as a guide to cautionary performance limits rather than immediate danger, allowing pilots to actively monitor their airspeed and mitigate risks effectively.