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The altimeter is subject to static pressure error. This error varies according to:
  • A
    TAS and altimeter setting.
  • B
    TAS and OAT.
  • C
    TAS and angle of attack.
  • D
    angle of attack and OAT.

The pressure error is caused by the position of the static ports, resulting in the disturbance of the airflow around the aircraft. This error may be influenced by many factors such as the angle of attack of the aircraft, the speed (Mach number, TAS, etc.), sideslip, configuration, etc.

The pressure error correction can be found in a table in the aircraft operations manual. Combined with the instrument error, it may be displayed on a correction card fitted next to each ASI so that the flight crew can apply to the IAS both error corrections and obtain the CAS.

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