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The Adiru on the Airbus 320 has an limit like 84°N latitude. What happens if the plane is flown above that latitude?

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    $\begingroup$ Hello, where do you take this limit from? Could you be misled by the limits related to magnetic heading computation area? $\endgroup$
    – Joël
    Mar 28 at 12:47
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    $\begingroup$ Related: Can you fly with INS/ IRS at higher lattitudes? $\endgroup$
    – Bianfable
    Mar 28 at 17:27
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    $\begingroup$ I am retired and no longer have access to the aircraft manuals, but I believe the B777 is not certified to fly over the True North Pole. $\endgroup$
    – Mike Sowsun
    Mar 29 at 2:42

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You don't get a valid heading and track angle. Each ADIRU model has different characteristics and limitation. This is an example from an FCOM that I have:

FCOM page

Special flights can fly in these conditions, but they don't use magnetic headings (see this question).

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