The airspeed indicator (ASI) is an aircraft flight instrument in which the speed of the aircraft is measured and conveyed to the pilot in either km/h, kn, MPH, or m/s. Having accurate airspeed measurements is important for the safety of flight, as well as aids in conducting accurate navigation of the aircraft. In this blog, we will discuss what the airspeed indicator flight instrument is, as well as how it functions and provides accurate measurements.