flight instrumentsFAA-published question bank (Private Pilot, 2008)
Under what condition will true altitude be lower than indicated altitude?
A
In colder than standard air temperature.✓ Correct Answer
B
In warmer than standard air temperature.
C
When density altitude is higher than indicated altitude.
Explanation
In colder than standard air the pressure levels are compressed closer to the ground, so the altimeter indicates higher than the aircraft actually is: true altitude is lower than indicated altitude (PHAK Chapter 8). In warmer than standard air the opposite occurs.
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