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altimeter corrections

Corrections that must be made to the readings of a pressure altimeter to obtain true altitudes. There are several sources of corrections: 1) pressure corrections due to changes in sea level atmospheric pressure readings; 2) air temperature corrections resulting from the differences between the actual temperature of the column of air beneath the altimeter and a standard atmosphere temperature profile; and 3) corrections for errors in the calibration of the mechanical parts of the altimeter.

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