What does a green arc on the airspeed indicator indicate?

The green arc on the airspeed indicator signifies the normal operating range for the aircraft. This range is critical for safe flight operations, as it indicates speeds at which the aircraft can be safely flown without risking adverse aerodynamic effects or structural issues.

Within the green arc, a pilot can operate the aircraft efficiently and comfortably, accessing optimal performance levels during various phases of flight, such as takeoff, cruise, and landing. Understanding this indication is vital, as flying within the green arc promotes safety and helps prevent situations that may lead to stalling or other undesirable flight conditions.

In contrast, speeds outside of this range, represented by other arcs, may pose increased risks, making it essential for pilots to recognize and adhere to the normal operating speeds indicated by the green arc.