According to CS-25, what is the minimum margin above reference stalling speed for reference landing speed (VREF)?

The correct response regarding the minimum margin above reference stalling speed for reference landing speed (VREF) is indeed 30%. According to CS-25 regulations, VREF is required to be established at a specified margin above the reference stalling speed in the landing configuration. This margin ensures that the aircraft operates safely and effectively during landing phases by providing sufficient speed to maintain controlled flight and prevent stalling.

In practical applications, this 30% margin above stalling speed adds an essential safety buffer when landing, compensating for factors such as pilot input variations, atmospheric conditions, and potential fluctuations in aircraft performance. By adhering to this requirement, manufacturers and operators can achieve a higher level of operational safety, particularly in real-world landing scenarios where conditions may not be perfectly ideal.

Understanding the significance of maintaining this margin is crucial for pilots and flight crews, as it directly impacts their approach and landing strategy. A margin that is too small could lead to stalling situations during critical phases of flight, emphasizing the importance of adhering to established safety standards like those encapsulated in CS-25.