What is the indicated stall speed (VSO) for aircraft discussed in the test?

The indicated stall speed, often referred to as VSO, is a critical parameter for pilots as it represents the minimum speed at which an aircraft can maintain controlled flight in landing configuration. This is typically measured at the maximum weight of the aircraft and with landing gear and flaps in the landing position.

In this case, the correct indicated stall speed of 45 knots indicates that for the specific aircraft being discussed, this is the speed at which it will start to stall if adequate lift is not maintained. Knowing this value is essential for safe flying, particularly during approach and landing phases, where operations at or near stall speed are common.

The other speed options signify conditions at which the aircraft could potentially stall under different configurations or weights, but they do not represent the specified stall speed for this aircraft with the appropriate configuration. Thus, selecting 45 knots as the indicated stall speed aligns with standard flight training and aircraft operational expectations, ensuring pilots understand the importance of maintaining awareness of this critical speed to prevent unintended stalls.