Lateral deviation on long legs
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Can confirm. Was flying EVRA - ENBR with a leg of 295NM. There was a big lateral deviation. It led to some confusion on VATSIM for the controllers as well.
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Normal IRS low accuracy in areas with no VOR references. No GPS on this airplane. Over Sahara my plane deviates too. Crossed Fom Azores to St John newfoubdland deviated too. Normal I think. If you get VOR's DME in the CDU the aircraft improves accuracy. Am I right?
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@tcarmona I can't imagine this is normal. I was flying across the English channel from SOPEK to OTBED and the green circle is the next waypoint I was assuming the lateral A/P was aiming for, but the yellow is where I ended up. Similar to the image from a previous member, my yellow airplane needle was not following the white path. -
@tcarmona I can't imagine this is normal. I was flying across the English channel from SOPEK to OTBED and the green circle is the next waypoint I was assuming the lateral A/P was aiming for, but the yellow is where I ended up. Similar to the image from a previous member, my yellow airplane needle was not following the white path.@martijn Hello! I understad, but over the Atlantic (and desert) I ended up far way from the point too. I red when the CDU doens't capture automatically (in bottom screen) the nearests VOR's (150NM...200NM signals) because is far from them, the accuracy, in a long leg tend to decrease, the IRS system makes kind of a triagulation with those VOR's. Not sure with IFR points... But when I asked "Am I right?" was for the specialists to awnser.
The airplane doesn't have GPS as you know. Don't know if the "problem" worsne more with latitude or longitude. I belive, anyway, someone can explain you much better than me. Best! -
I don't think this is a limitation of the non-GPS architecture of this aircraft. DME/DME and IRS should not deviate that much during short flights (and I doubt they have simulated degradation either). The plane is artificially not following the track, so it's up to JF to fix it.
