What color identifies the power-off stalling speed in a specific configuration on an airspeed indicator?

The power-off stalling speed in a specific configuration is indicated by the lower limit of the green arc on an airspeed indicator. This specific speed represents the minimum speed at which the aircraft can maintain controlled flight in a clean configuration (e.g., flaps retracted).

The green arc indicates the Normal Operating Range, where the aircraft can operate safely without risking a stall in normal conditions. The lower limit of this green arc is critical for pilots as it shows the threshold below which the aircraft may experience a stall if not handled appropriately.

Understanding this aspect of the airspeed indicator is vital for ensuring safe flight operations, particularly during takeoff and landing phases when the aircraft is typically operating closer to these lower speeds. Recognizing the stalling speed helps pilots make informed decisions and maintain appropriate speeds during flight maneuvers.