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Sport Pilot Airplane practice question 31

Under what condition is indicated altitude the same as true altitude?

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Correct answer: B. When at sea level under standard conditions.

Indicated altitude equals true altitude only under standard atmospheric conditions with the altimeter correctly set, for example at sea level on a standard day. Nonstandard temperature or pressure makes them differ.

References

Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), p. 8-4, Flight Instruments · search it in our library

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Question 31 from the FAA document Sport Pilot Airplane (SPA) Sample Questions (U.S. Government work, public domain) · ACS/LSC code PLT023. The FAA does not publish an answer key; the answer and explanation are ours, with references. Verify against the current regulations and handbooks.