If the air is warmer than standard, is true altitude (TALT) higher or lower than indicated altitude (IALT)?

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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

If the air is warmer than standard, is true altitude (TALT) higher or lower than indicated altitude (IALT)?

Explanation:
Warm air makes the atmosphere less dense and raises the pressure surfaces. An altimeter reads altitude from ambient pressure using the standard atmospheric model. When the air is warmer than standard, the pressure at a given true height is higher than the standard value, and pressure decreases more slowly with height. Because of this, the altimeter interprets that higher pressure as being at a lower geometric height, so the indicated altitude is lower than the actual height. Thus true altitude is higher than indicated altitude.

Warm air makes the atmosphere less dense and raises the pressure surfaces. An altimeter reads altitude from ambient pressure using the standard atmospheric model. When the air is warmer than standard, the pressure at a given true height is higher than the standard value, and pressure decreases more slowly with height. Because of this, the altimeter interprets that higher pressure as being at a lower geometric height, so the indicated altitude is lower than the actual height. Thus true altitude is higher than indicated altitude.

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