PPRuNe Forums - View Single Post - Basic Aeronautical Knowledge: Altimetry and margins of error

18th Apr 2022, 20:50

#17 (permalink)

RedwireBluewire

Join Date: Feb 2009

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Tolerance for the Mode C encoder is +/- 125ft at all altitudes.
Tolerance at your theoretical 500 ft on your altimeter is +/- 20ft. This tolerance gets wider as you increase altitude, for instance at 10,000ft, the tolerance is +/- 80ft.

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