ATPL 022 Instrumentation Practice Questions - EASA ATPL(A) Theoretical Knowledge - Aircraft General Knowledge Instrumentation (Subject 022) Exam

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An aircraft maintains a constant pressure altitude indicated on the altimeter while flying from a region of warm air into a region of significantly colder air. What happens to the true altitude (true height above the terrain at constant pressure)?

True altitude increases because cold air is denser. True altitude is unchanged because the altimeter is reading correctly. True altitude oscillates around the indicated value. True altitude decreases, so the aircraft is lower than indicated.

Correct Answer:

True altitude decreases, so the aircraft is lower than indicated.

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