What speed range is represented by the green arc on the airspeed indicator?

The green arc on the airspeed indicator represents the Normal Operating Range for the aircraft, specifically the speeds at which the pilot can safely operate the airplane without stress on the structure or risk of stalling. In the case of the Cessna 152, this range is typically from 40 to 111 KIAS (Knots Indicated Airspeed). This speed range indicates both the minimum speed for controlled flight (which is just above stall speed) and the maximum speed for normal operation, ensuring safe flight conditions during various phases like takeoff, climb, cruise, descent, and landing.

Operating within this speed range helps the pilot maintain proper control of the aircraft and is key to achieving the desired performance during normal operations. Understanding this range is crucial for ensuring safe flying practices.