I don’t know why but there is red text for an altitude on my flight?
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Hey!
This means that you have a descent gradient of more than 5 degrees (steep) - a 4000ft descent in only 8.6nm is a bit of a stretch. You could maybe only reasonably descend 2500-3000ft in that distance.
I can see its what Simbrief gave you - it does give rather steep descents in some aircraft.
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For future reference:
White Altitude: descent of 3° (or less)
Amber Altitude: descent between 3° and 5°
Red Altitude: descent in excess of 5°
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It’s VS based, not degree-based. Orange is 2500, red is beyond 3000. Commercial planes descend at pretty steep rates IRL anyway - many will push mid-3s to mid-4s on the way down, so it’s really not unreasonable. Our AP is very simple in that it doesn’t support various descent modes like open descent.
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Thanks for the correction - I was going off what I was told. 
Edit: just got confirmation from a second source of it being VS based.
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Can’t wait for a LVL CHG one day 
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Didn’t know we had this feature, is it a recent one? Or was it always there when VNAV was implemented?
Since when? I’m reading the internal notes and it specifically states its gradient based.
It’s certainly new-ish. Not sure, but think it was 25.1. I saw it for the first time the other day.
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I believe it was introduced in 25.1, as I use the same flight plans from time to time and it just started showing this feature after the update. I was also under the impression that it was gradient based, but perhaps it is vs?
It’s new for 25.1. VS requires ground speed to be incorporated along the descent path and that’s not what is occurring here. It is simple gradient calculation between the corresponding pair of waypoints.
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