Loading ...Each and every aircraft altimeter is set ‘on the ground’ at the airport before takeoff. Barometric pressure is read to the pilot, and he calibrates his altimeter for that airport. Once climbing out to ‘en-route altitude’ the altimeter is again reset to standardized high altitude barometric pressure, so all high altitude planes are reading the same. When an aircraft approaches an airport, the pilot is required to obtain the wind, weather, and barometric pressure at the airport, and reset his altimeter. So no matter what, all planes in the area have the same barometric pressure reading and all read the same calibrated altitudes.
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