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Question about RNAV capabilities

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

    Hello, I'm just wondering if the BAE146 equipped with the UNS1 is supposed to be able to conduct rnav turns such as the one in the image below. This is a 270 degree left turn towards a waypoint. The main question is what is the rnav capability of the aircraft with the UNS1 retrofitted? I am aware that it is incapable of conducting RNP procedures. sdarafs.png

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    • LaurrethL Offline
      LaurrethL Offline
      Laurreth
      wrote on last edited by
      #2

      "RNAV 1" (formerly known as P-RNAV) mentioned in the header of the chart indicates that it is and RNP procedure, so the UNS-1 likely shouldn't be able to do it.

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      • A Offline
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        Arek5
        wrote on last edited by
        #3

        Ah ok, thanks for the info. Do you know what RNAV category the uns can handle?

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        • LaurrethL Offline
          LaurrethL Offline
          Laurreth
          wrote on last edited by Laurreth
          #4

          I haven't found any documentation on the supposed capabilities of the UNS-1 as simulated in the 146 (the current UNS-1 units are pretty complete packages for modern environments it appears), but with the way it behaves I'd assume it does pure point-to-point GNSS without any augmentation, DME/DME, or INS support, supporting "track to fix" legs. So basically anything that's straight lines between waypoints. The whole field is a confusing mix of terminology where RNAV and RNP with various pre- and suffixes as well as numerical designators come and go and sometimes change meaning altogether.

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          • MarkM Offline
            MarkM Offline
            Mark
            JF Staff
            wrote on last edited by
            #5

            I suspect the root cause of this particular SID is that there is no information in the UNS-1s Navdata to dictate which direction the turn should be made for that SID. So once the aircraft flies over the 3,000ft fix the UNS-1 is calculating that the shortest direction of turn to the ZB100 fix is a right turn, so it turns to the right.

            I have logged this with the UNS-1s development team to take a look into and we'll see if there's anything that can be improved for a future update.

            Mark - Just Flight

            Just Flight Development Assistant

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            • A Offline
              A Offline
              Arek5
              wrote on last edited by
              #6

              Any chance this could be improved for the f28 v2 release?

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              • MarkM Offline
                MarkM Offline
                Mark
                JF Staff
                wrote on last edited by
                #7

                We currently have an update to the UNS-1 in development and we do have a fix for this procedure included in that. This update will be included in both the 146 and F28 once we have tested and approved it for release.

                Mark - Just Flight

                Just Flight Development Assistant

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