True Airspeed
True Airspeed (TAS) is a term used in aerospace engineering to denote the actual speed of an aircraft relative to the air mass through which it is moving. It is the speed of the aircraft through the air, corrected for altitude and temperature variations known as density altitude. TAS is a critical factor in flight planning and navigation because it directly affects the time and fuel consumption of a flight. It is calculated by correcting the Indicated Airspeed (IAS) for pressure altitude and temperature. The IAS is the airspeed read directly from the aircraft's airspeed indicator, but it does not account for changes in air density due to changes in altitude and temperature. Therefore, the TAS is a more accurate measure of the aircraft's speed through the air mass. It is important to note that TAS is different from Groundspeed (GS), which is the speed of the aircraft relative to the ground. GS takes into account the wind speed and direction, while TAS does not.
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