Knots Indicated Airspeed


Knots Indicated Airspeed (KIAS) is the airspeed read directly from the airspeed indicator of an aircraft, calibrated to reflect standard atmosphere adiabatic compressible flow at sea level for a particular aircraft. It is expressed in knots and is the speed of the aircraft relative to the surrounding air. KIAS is used by pilots to determine the aircraft's performance, such as takeoff and landing speeds, as well as to maintain safe and efficient flight operations.


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