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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.
Standard atmosphere tables. By Jack Williams, USATODAY.com. The standard atmosphere can be thought of as the average pressure, temperature and air density for various altitudes. It is useful for engineering calculations for aircraft.It also shows in a general way the pressures and temperatures to be expected at various altitudes.tandard atmosphere tables. By Jack Williams, USATODAY.com. The standard atmosphere can be thought of as the average pressure, temperature and air density for various altitudes. It is useful for engineering calculations for aircraft.