Pressure Altitude Definition
Pressure altitude is the vertical distance above a standard datum plane where the atmospheric pressure is corrected to 29.92 inches Hg at sea level and a temperature of 15°C. It is calculated by setting the altimeter to 1013 hPa (in the US and Canada the standard is 29.92 inHg) and reading the indicated altitude. This altitude reading is not affected by variations in local atmospheric pressure due to weather conditions or other factors. The pressure altitude is used to determine aircraft performance and is crucial for accurate navigation and instrument flying. It is also a key reference point for air traffic controllers to ensure safe separation between aircraft and accurate flight level assignments. In summary, pressure altitude is a standardized measurement of vertical distance above the earth’s surface, corrected for variations in atmospheric pressure, and is essential for safe and efficient aviation operations.
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