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|. International Standard Atmosphere (ISA) is a model used for the standardization of aircraft instruments. It was established, with tables of values over a range of altitudes, to provide a common reference for temperature and pressure. Flying in ISA-plus temperatures will have a negative impact on aircraft performance.
Description. Also known as the ICAO Standard Atmosphere, ISA is a standard against which to compare the actual atmosphere at any point and time. The ISA is based the following values of pressure, density, and temperature at mean sea level each of which decreases with increase in height: 1  Pressure of 1013.2 millibar-Pressure is taken to fall at about 1 millibar per 30 feet in the lower atmosphere (up to about 5,000 feet).