Your aircraft is flying at an indicated altitude of 3,000 feet with the Kollsman Window properly set to the current altimeter setting. If the temperature is colder than standard, what will be the aircraft's true altitude?

Question

Your aircraft is flying at an indicated altitude of 3,000 feet with the Kollsman Window properly set to the current altimeter setting.  If the temperature is colder than standard, what will be the aircraft's true altitude?

BlackTom AI · Accepted Answer

When evaluating true altitude in cold air, the air is denser and the atmosphere is compressed, causing true altitude to be lower than the indicated altitude if the altimeter setting is correct. 
Option 1: 'At 3,000 feet.' This would imply no change between indicated and true altitude, which is not the case in a colder-than-standard atmosphere; the true altitude will typically be less than the indicated altitude, not equal.
Option 2: 'No answer text provided.' This option is not a substantive choice and provides no information to assess the scenario; it should be disregarded as it does not address the question.
Option 3: 'Lower than 3,000 feet.' This aligns with standard aviation knowledge that cooler temperatures reduce true altitude relative to the indicated altitude when the altimeter is set correctly, so the aircraft sits lower on the ground than the altitude readout would suggest.
Option 4: 'Higher than 3,000 feet.' This would be true in a warmer-than-standard atmosphere or with an erroneous high altitude indication, but not in the described colder-than-standard conditions. It contradicts the physics of air density and pressure in cold air.

WX 301 Practice Final Exam - Fall 2025

Your aircraft is flying at an indicated altitude of 3,000 feet with the Kollsman Window properly set to the current altimeter setting. If the temperature is colder than standard, what will be the aircraft's true altitude?

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