According to 14 CFR part 1, VNO is defined as what?

VNO, also known as the maximum structural cruising speed, is the speed that defines the upper limit of the green arc on an aircraft's airspeed indicator. This speed is significant because it represents the maximum speed at which an aircraft can be safely flown in turbulent air. Operating above VNO may lead to structural damage if the aircraft encounters turbulence, as it increases the likelihood of exceeding design load factors.

Understanding VNO is crucial for pilots because it helps ensure safe and effective handling of the aircraft during normal operations. It is distinctly different from other speeds, such as maximum operating speed, which is a limit beyond which the aircraft should not be flown, and normal operating speed, which refers to a general range of safe speeds for routine flying. The correct recognition of VNO supports pilots in maintaining a safe operating speed envelope, particularly during flight conditions where turbulence might be encountered.