What is the stall speed (Vs) in KIAS?

The stall speed (Vs) is a critical performance parameter for any aircraft, especially for multi-engine operations. It is defined as the minimum speed at which an aircraft can maintain level flight without stalling. The stall speed can vary based on several factors such as aircraft weight, configuration (flaps and landing gear position), and the loading of the aircraft.

In this scenario, if the stall speed is identified as 57 KIAS, it is likely derived from the aircraft’s specific performance data, which would be available in the Pilot’s Operating Handbook (POH) or operating manual for the aircraft in question. Knowing the stall speed is crucial for safe operations, particularly during takeoff and landing phases, where the risk of a stall is heightened due to maneuvering at lower speeds.

The significance of accurate stall speed determination cannot be overstated, as operating at or below this speed increases the risk of losing control of the aircraft. In multi-engine aircraft, understanding stall speeds is essential for performance calculations, especially during engine-out scenarios, as this can significantly influence the aircraft's performance characteristics and handling.

Therefore, identifying the stall speed as 57 KIAS aligns with the need for pilots to operate safely within their aircraft's defined performance parameters.