What is Vso?

Vso is defined as the stall speed of an aircraft in a specified configuration, which typically means flaps and landing gear are down. This is an important parameter for pilots as it represents the minimum speed at which the aircraft can maintain controlled flight in that configuration. Knowing Vso is essential during landing approaches, as pilots must be careful to maintain a speed above Vso to avoid stalling the aircraft.

The other options refer to different aspects of performance or limitations: the maximum structural cruising speed is a different speed that indicates the upper limit of safe operation, the caution range speed pertains to speeds that should be avoided in turbulent air, and the never exceed speed is the absolute maximum speed that should never be exceeded to prevent structural damage. Understanding Vso ensures better safety and operational effectiveness during flight maneuvers, particularly during critical phases such as approaching for landing.