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The altimeter of an aircraft provides indications from 0 - 50 000 ft. The aircraft is on a position of known elevation at the airfield and the altimeter is set to the local QNH. The altimeter will read the elevation of that point…

  • A

    plus the height of the altimeter from the ground with a +/- 60 ft tolerance.

  • B

    plus the height of the altimeter from the ground with a +/- 80 ft tolerance.

  • C
    +/- 80 ft tolerance.
  • D
    +/- 25 ft tolerance.
The altimeter is not a perfect instrument and small errors might always be present. However, it is very important to define the tolerances within which an altimeter can be safely operated.
  • ± 60 ft between for an altitude range between 0 – 30 000 ft.
  • ± 80 ft between for an altitude range between 0 – 50 000 ft.

 

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