sztrova Posted January 22, 2022 Report Share Posted January 22, 2022 Is it also related to IRS-FMS disagree? Is it possible to fix that in flight? Quote Link to comment Share on other sites More sharing options...
Graeme_77 Posted January 22, 2022 Report Share Posted January 22, 2022 You'd need to diagnose that inflight. Don't assume it's a bug or sim feature. Quite common to have nav downgrades when flying. Have a look at all the position outputs available in the FMS and try to work out what has happened. Quote Link to comment Share on other sites More sharing options...
sztrova Posted January 22, 2022 Author Report Share Posted January 22, 2022 Thank you. Once I figure it out is there a way to force some nav (IRS or GPS) to be the main source and let the others align themselves to it during flight? Or by picking up nearby VORs can I reset the position? Quote Link to comment Share on other sites More sharing options...
sztrova Posted January 25, 2022 Author Report Share Posted January 25, 2022 (edited) Sorry to ask again, but is there a solution to my question? Edited January 25, 2022 by sztrova Quote Link to comment Share on other sites More sharing options...
Graeme_77 Posted January 28, 2022 Report Share Posted January 28, 2022 The system will automatically select the best source of position information. Have a look at the POS SUMMARY MFD DATA page, then the FMC Position study window to help understand how it's all working. Quote Link to comment Share on other sites More sharing options...
bpcw0001 Posted May 9 Report Share Posted May 9 (edited) Yes, it is understood that the system will pick the best available position source. Nevertheless, how is IRS-FMS disagree fixed in flight? Can an IRS-FMS-disagree be fixed in flight at all? Unfortunately, there is no QRH info on that one available to me. Is it just disabling the IRS'es, and re-enabling them in flight, and waiting for a realign? If you fly in the Middle East with a lot of GPS jamming and spoofing, having an unreliable IRS all of a sudden is not a good thing ... Edited May 9 by bpcw0001 Quote Link to comment Share on other sites More sharing options...
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