altimeter correction

altimeter correction

altimeter correctionclick for a larger image
The amount of height that must be added to the height indicated by an altimeter to obtain true height above the sea level. The altimeter is set to the standard altimeter setting.
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The hypsometric equation combines the hydrostatic equation used in the above stack effect formula with the ideal gas law and is the basis for the table values published in the Aeronautical Information Manual for altimeter correction when flying between airports at different temperatures.
It's partially the data that's evaluated during the test and then recorded on an altimeter correction card affixed to the logbooks (each altimeter in the aircraft should always be mated with a correction card).
Regardless, such a system may require activation by maintenance personnel during installation in order to be functional, and some systems may apply temperature ased altimeter corrections all the time.
The system of putting altimeter corrections in the maintenance logs is one of the biggest tricks played upon pilots by mechanics.