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The pressure altitude is equal to the true altitude if..
  • A
    the outside air temperature is standard for that height.
  • B
    standard atmospheric conditions occur.
  • C
    the indicated altitude is equal to the pressure altitude.
  • D
    the air pressure is 1013.25 hPa at the surface.

An altimeter works on the principle of the ICAO Standard Atmosphere. ISA is the standard at which you can compare the actual atmosphere with at any point.

  • True Altitude = Pressure Altitude + Pressure Correction + Temperature Correction

Therefore, if standard temperature exists but non standard pressure, the altimeter reading will have an error. If standard pressure exists but non standard temperature, the altimeter reading will also have an error.

True Altitude will be equal to Pressure Altitude if standard atmospheric conditions are present in the atmosphere.

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