What is the purpose of an airspeed indicator?

The airspeed indicator serves the crucial purpose of providing velocity data. It measures the speed of the aircraft relative to the surrounding air, which is a vital aspect of flight operation and safety. By indicating the true airspeed or indicated airspeed, it helps pilots determine how fast they are flying and makes it possible to manage flight dynamics effectively.

Understanding airspeed is essential for various flight maneuvers, including takeoffs, landings, and maintaining optimal flight performance. It allows pilots to assess whether the aircraft is flying within the recommended speed limits, which is important for preventing stalls or excessive speeds that could lead to structural damage.

While other instruments measure different parameters—such as altitude, fuel levels, or engine temperature—the primary function of the airspeed indicator is focused solely on the aircraft's velocity relative to the air through which it is moving.