What is the maximum structural cruising speed (VNO)?

The maximum structural cruising speed (VNO) is specifically defined as the maximum speed at which the aircraft can be safely flown in turbulent air. It represents the upper limit of the green arc on a typical airspeed indicator, signaling that the aircraft is operating within its normal operating conditions. Flying above this speed can increase the risk of structural stress, especially in turbulent conditions, as the aircraft may experience significant and uncommanded load factors.

In this context, VNO is a critical airspeed for pilots to know because it helps ensure the integrity of the aircraft structure during flight. When approaching or exceeding this speed, the structural limits of the aircraft may be tested, possibly leading to adverse consequences.

Among the provided choices, the value of 160 knots accurately reflects a plausible maximum structural cruising speed for many general aviation aircraft, aligning with typical performance specifications for broader categories of light aircraft. Thus, recognizing and adhering to this speed during flight planning and operations is vital for safety.