Which speed indicates the stall speed in landing configuration for the C-172SP?

The stall speed in landing configuration for the C-172SP is indeed 40 KIAS (Knots Indicated Airspeed). This speed is crucial for pilots to understand as it represents the minimum speed at which the aircraft can maintain controlled flight. When the aircraft is configured for landing, typically with flaps extended, the stall speed decreases due to the increased lift generated by the flaps.

Knowing this speed helps pilots ensure they do not inadvertently allow the aircraft to descend below this speed during approach and landing, which could lead to a stall. This understanding emphasizes the importance of maintaining appropriate speed within the landing configuration to ensure a safe approach and landing. It's essential for pilots to be familiar with the specific stall speeds of their aircraft, as different configurations and weights can affect performance.