Private Pilot License (PPL) Aerodynamics Practice Exam

In the landing configuration, what indicates the power-off stalling speed?

1. Lower limit of white arc

2. Upper limit of white arc

3. Upper limit of green arc

4. Red line

The correct answer is: Lower limit of white arc

In the landing configuration, the power-off stalling speed is indicated by the lower limit of the white arc on the airspeed indicator. The white arc represents the range of speeds at which the aircraft can safely operate with flaps extended. The lower limit of this arc signifies the stalling speed in a landing configuration, known as VS0, which is the minimum speed at which the aircraft can maintain controlled flight with full flaps. This is particularly important in the context of safe landings, as it reflects the minimum airspeed needed to avoid stalling while in the landing configuration, providing pilots with a critical reference to ensure they do not inadvertently descend below a safe airspeed as they approach to land. In contrast, the limits represented by other arcs on the airspeed indicator correspond to different flight phases and conditions, emphasizing the significance of the lower white arc limit for safe landing maneuvers.