What is kias

The airspeed is always indicated to the pilot through either a dedicated airspeed indicator gauge or as a linear scale on Primary Flight Display PFD. There are a couple of them, and in this article, we are going to look closer at:. The Knots Indicated Airspeed KIAS is the airspeed directly measured from the pitot probe and is indicated to the pilot on his airspeed display. KIAS is a direct indication of airflow dynamic air pressure around the fuselage and wings of an airplane and this value, therefore, holds significance in terms of safe flying limits of airplanes.

This type of airspeed is directly indicated to pilots as all-important limits or V-speeds are identified in terms of KIAS. As the take-off, stall or structural integrity of an airplane directly depends upon the airflow around the aircraft, KIAS is constantly monitored by the pilots during all phases of flight.

The Knots Calibrated Airspeed is the airspeed measured by the pitot probe and corrected for the instrumentational or positional error of the pitot probe. In other words, it is slightly more complicated! The Pitot Tube or Pitot Probe of an aircraft is mounted on aircraft in the forward section of the fuselage in most cases and on the wings in some cases. Although, the aircraft designers make sure that the pitot probe is positioned to ensure minimal errors due to changing flap configuration or so on, the errors still exist.

Similarly, like any other sensing device, a certain instrumentation error is also present in the pitot probe and indicating devices. The calibrated airspeed is calculated after incorporating all such positional and instrumentational errors into the value of indicated airspeed. Although KCAS is not displayed to the pilot, it is still important for pilots to know and understand the difference is calibrated and indicated airspeed for the type of aircraft they are flying.

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