At 8,500 feet with an ambient temperature of 10°C, how does the true altitude compare to the indicated altitude?

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Test your knowledge of pitot-static systems for aviation exams. Study with multiple-choice questions and detailed explanations. Prepare effectively for success on your exam!

Multiple Choice

At 8,500 feet with an ambient temperature of 10°C, how does the true altitude compare to the indicated altitude?

Explanation:
Temperature deviations from the standard atmosphere change how the altimeter’s reading relates to the actual height above the surface. When the air is warmer than ISA, pressure surfaces expand upward, so the pressure you sense corresponds to a higher geometric height than ISA would predict. Therefore, the true altitude ends up higher than what the altimeter indicates. If the air were colder than standard, the opposite would occur. In this scenario, with a warmer-than-ISA temperature, the true altitude is higher.

Temperature deviations from the standard atmosphere change how the altimeter’s reading relates to the actual height above the surface. When the air is warmer than ISA, pressure surfaces expand upward, so the pressure you sense corresponds to a higher geometric height than ISA would predict. Therefore, the true altitude ends up higher than what the altimeter indicates. If the air were colder than standard, the opposite would occur. In this scenario, with a warmer-than-ISA temperature, the true altitude is higher.

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