Aircraft don’t really exactly know their altitude. They fly at a pressure, that is indicated as an altitude via equations in the Standard Atmosphere. What is the altitude of a plane in flight? When flying a plane, the pilot needs to know exactly how high above the earth the plane is traveling, a measurement that is called altitude. Types of Altitude: Indicated Altitude Let's start with the easiest - indicated altitude is simply the altitude you read directly off your altimeter. If uncorrected for pressure changes, your altimeter won't be very useful. True Altitude True altitude refers to the height of an aircraft above sea level. This type of altitude is measured in terms of “feet above mean sea level". Pressure Altitude Pressure altitude is a measurement of the aircraft’s altitude above a standard datum plane Pressure altitude is also used in many flight planning calculations, including determining takeoff and landing distances. Density Altitude Density altitude is pressu...
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