Vne

Vne, short for never-exceed speed, is an aviation term that designates the maximum indicated airspeed at which an aircraft may be operated in normal flight. It is the redline speed shown on the airspeed indicator and is published in the aircraft’s flight manual as part of the speed envelope. Operating above Vne can cause structural damage or loss of control, and the limit is intended to protect the airframe from excessive dynamic pressure.

The Vne value is determined through certification testing and is tied to the aircraft’s structural limits. It is typically stated for a specific configuration, usually clean (flaps up, gear retracted). Many airplanes also publish other speed limits, such as Vno (maximum structural cruising speed) and various stall, approach, or maneuvering speeds. Some aircraft have multiple Vne values for different configurations or bank angles, reflecting how load factors affect safe operation.

Vne is specified in indicated airspeed (IAS). Because air density decreases with altitude, true airspeed (TAS) corresponding to Vne increases with altitude, even though the IAS limit remains the same. Pilots use the red arc on the airspeed indicator to avoid exceeding Vne, and procedures often require maintaining speeds well below Vne in turbulence or during aggressive maneuvers.

In practice, Vne forms part of the aircraft’s operating envelope and is a critical reference for flight planning and in-flight speed management. Respecting Vne helps prevent structural overstress and ensures predictable handling across the aircraft’s certified performance.