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If an aircraft is fitted with two altimeters and only one is corrected for position error; all other factors being equal...

  • A

    At high speed, the non-compensated altimeter will indicate a higher altitude

  • B

    ATC will get an erroneous altitude report SSR

  • C

    There will be no difference between them if the air data computer (ADC) is functioning normally

  • D

    At high speed the non-compensated altimeter will indicate a lower altitude

Position or Pressure Error is the error caused by disturbed airflow around static ports and pitot heads.

Aircraft designers position pressure sources carefully to minimise these errors but there will always be some residual error which has to be compensated for.

Position error increases with aircraft speed, a lower than actual static pressure will be sensed at high Mach Numbers causing an uncompensated altimeter to over-read.

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