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Marenostrum

IRS reset

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When The flight is completed and I am at the gate for the turnaround, if I check my position I often see that the GPS and IRS are not exactly the same. 

The difference tipically is very small.

the question is, in real world is there a maximum discrepancy after that you have to realign the aircraft position? Or is it done only in  the cold and dark startup?

thank you

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7 minutes ago, Marenostrum said:

When The flight is completed and I am at the gate for the turnaround, if I check my position I often see that the GPS and IRS are not exactly the same. 

The difference tipically is very small.

the question is, in real world is there a maximum discrepancy after that you have to realign the aircraft position? Or is it done only in  the cold and dark startup?

thank you

Discrepancies are always present and in real life

After you shut down at the gate you turn off the IRS and realling them before the next flight. This is what most of the companies I know of do.

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Depending on previous flight length I sometimes use the Fast Realignment procedure as explained in FCOM1 SP11.3

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