Atmospheric Pressure Error


Atmospheric Pressure Error is the difference between the actual atmospheric pressure and the pressure that the altimeter is indicating. This error occurs because the altimeter is calibrated to sea level pressure, which is 29.92 inches of mercury or 1013.2 millibars. As the aircraft climbs or descends, the atmospheric pressure changes and the altimeter reading will be affected. If the altimeter is not adjusted for the current atmospheric pressure, it will display an incorrect altitude. This error can be corrected by setting the altimeter to the current local altimeter setting, which is obtained from the nearest weather station or air traffic control.


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