Which arc on the airspeed indicator represents the normal operating range?

The green arc on the airspeed indicator denotes the normal operating range for the aircraft. This range is crucial for safe flight operations, as it indicates the speeds at which the aircraft can be safely flown without risking structural damage or excessive airframe stress. It represents the speed at which the aircraft can be safely controlled, maneuvered, and operated under normal conditions.

Understanding this range is vital for a pilot, as it helps determine the speeds during various phases of flight, such as takeoff, landing, and level flight. Proper adherence to the green arc ensures that the pilot operates the aircraft within safe limits, thereby minimizing the risk of stalls or excessive airspeed.

The other arcs on the airspeed indicator have specific significance and thresholds. For instance, the white arc typically indicates the flap operating range, while the yellow arc denotes the caution range where pilots should exercise extra vigilance. The red line represents the never-exceed speed (Vne), which is the maximum speed the aircraft should not exceed under any circumstances. Understanding these different ranges and their implications on flight safety is essential for every pilot.