Archive for July, 2010

Answers: Aircraft altimeter errors

Saturday, July 31st, 2010

Q: Can you help me understand in very simple terms altimeter error when flying from high to low pressure areas and from low to high areas?  I am studying it but its just not clicking.—Mark, Noblesville, Ind. A: To answer  your question I'll begin with some basic information about aircraft altimeters and then use the diagram below to help you see... »

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Altimeter temperature change diagram

Saturday, July 31st, 2010

The diagram below helps explain why an aircraft's pressure altimeter will read lower than the true altitude if the aircraft flies from an area with warm air to an area with cold air. If an aircraft flies from an area of cold air to an area with warm air its altimeter will read higher than the true altitude. The explanation for this... »

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Altimeter pressure change diagram

Saturday, July 31st, 2010

The image below helps explain why an aircraft altimeter will read lower than true altitude if the aircraft flies from an area of relatively high atmospheric pressure to an area of lower pressure without changing the altimeter to reflect the sea-level setting. An article on how air pressures affect aircraft altimeters is... »

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