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V2 flight path issue

Scheduled Pinned Locked Moved 146 Professional
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  • A Offline
    A Offline
    Arek5
    wrote on last edited by
    #1

    Found an issue where the v2 using the new uns1 fms cannot follow the flight path on a departure. It takes a much wider turn and struggles to stay on course. The departure I am referring to is the EGPH RWY 06 GOSA1D departure. It struggles with the turn from D050C to GOW35. It takes it very wide and i had to manually correct it. Untitled.png

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  • MarkM Offline
    MarkM Offline
    Mark JF Staff
    wrote on last edited by
    #2

    @Arek5 Could you let us know if you were using the default Navdata that is included with the UNS-1 or was the Navdata updated through the Navigraph Hub app?

    Just Flight Development Assistant

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  • A Offline
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    Arek5
    wrote on last edited by
    #3

    I updated the bae146 navdata on navigraph hub after downloading the update v2.0. Additionally when this was happening, the control column started shaking left and right and the hsi was directing correctly but the aircraft didn't turn nowhere sharp enough.

    MarkM 1 Reply Last reply
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  • MarkM Offline
    MarkM Offline
    Mark JF Staff
    replied to Arek5 on last edited by
    #4

    @Arek5 I've just flown the GOSA1D SID and the UNS-1 has flown it without any extended turns like what is shown in your screenshot, so I don't believe the issue you are seeing is with the UNS-1.

    The shaking control column is an interesting one though. Do you recall if you were intercepting an altitude at the time this issue occurred? I seem to recall we used to have a bug with the 146 where lateral navigation modes wouldn't like changing heading in certain conditions whilst an altitude is being captured. That was a difficult issue to replicate at the time, but we thought we fixed it as we never had it reported since, but I'm wondering if that might be what's occurring here.

    Mark - Just Flight

    Just Flight Development Assistant

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  • A Offline
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    Arek5
    wrote on last edited by Arek5
    #5

    I believe that I was still in climb and not capturing an altitude. I was in pitch mode and lnav. i have had the shaky controls during a turn quite a few times even before this update. It's like the aircraft begins a turn then decreases the bank angle, shakes a bit, and then increases the bank angle to attempt to reaquire the course.

    MarkM 1 Reply Last reply
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  • MarkM Offline
    MarkM Offline
    Mark JF Staff
    replied to Arek5 on last edited by
    #6

    @Arek5 Thanks for the extra info. We suspect the root cause of the issue is the basic autopilot "PITCH" mode, and it seems like there may be some sort of conflict with the MSFS autopilot modes when the 146 is in an altitude capture state with "PITCH" mode and a lateral navigation mode active.

    We'll reopen our investigations into this to see if we can get to the bottom of it.

    Mark - Just Flight

    Just Flight Development Assistant

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