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The machmeter is subject to position error. This error varies according to:

1) angle of attack
2) OAT
3) TAS

The combination that regroups all of the correct statements is:

  • A
    1, 3
  • B
    1,2,3
  • C
    2
  • D
    3

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. As the airflow is getting more disturbed with increasing airspeed, the higher the airspeed the higher the position error.

Note: The pressure error is the same for all the instruments (machmeter, airspeed indicator, VSI, altimeter, etc.)

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