flight instrumentsFAA-published question bank (Private Pilot, 2008)
Under which condition will pressure altitude be equal to true altitude?
A
When the atmospheric pressure is 29.92 inches Hg.
B
When standard atmospheric conditions exist.✓ Correct Answer
C
When indicated altitude is equal to the pressure altitude.
Explanation
Pressure altitude is height above the standard datum plane, so it equals true altitude only when the atmosphere is standard (29.92 inches at sea level and standard temperature lapse). A pressure of 29.92 at your location, or indicated altitude equal to pressure altitude, does not make the whole column of air standard.
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