What does the green arc on the airspeed indicator represent?

The green arc on the airspeed indicator indicates the normal operating range of the airplane. This range represents the speeds at which the aircraft can safely operate under typical flying conditions. Operating within this range is crucial for maintaining control and ensuring safe flight performance.

Each color on the airspeed indicator denotes specific operational limits: the green arc shows that the aircraft is within a safe speed for maneuvering, while other colors indicate different significant limits, such as stall speeds or maximum speeds. Understanding that this arc encompasses the normal flight performance speeds helps pilots make informed decisions during various phases of flight, ensuring they remain within safe operational parameters and avoid excessive speeds that might lead to structural stress or aerodynamic issues.