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Instrument Flying Handbook Menu>Aerodynamic
Factors>Atmosphere>Pressure
Altitude
There are two measurements of the atmosphere
that pilots must understand: pressure altitude and density altitude.
Pressure altitude is the height above the standard datum pressure
(29.92" Hg) and is used for standardizing altitudes for
flight levels (FL) and for calculations involving aircraft performance.
If the altimeter is set for 29.92" Hg, the altitude indicated
is the pressure altitude.
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