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Massive Bump From Behind During After-Start

Scheduled Pinned Locked Moved 146 Professional
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  • K Offline
    K Offline
    KosmicRavioli
    wrote last edited by
    #1

    Hi everyone,

    Bought the 146 a couple of days ago. Learning the quirks of it, doing alright.

    One thing that makes my head scratch however, is that when I'm done with pushback and during my after-start flow, I get this MASSIVE bump from behind, as if someone just ran into me at full speed while waiting at the lights. The plane gets thrown 10-20m forward and because I have the parking brake set at the time, brake temps spike to well over 750-C.

    So I guess my question is; what on earth is going on?

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    • A Offline
      A Offline
      Avionic
      wrote last edited by
      #2

      It's been a while since I've flown the 146 (waiting for 2024 variant) - not sure if I remember something like that kick in the behind, but it did certainly have some awkwardness with GSX pushbacks.

      Whenever a towbarless tug was used, the lifting action would somehow mess with the brakes, and they would aggressively heat up to +750 C. (less than ideal in case of an aborted TO!). Could this be related to what you are seeing as well (perhaps with the kick coming once the tug sets the nosewheel free again?).
      Not sure if it eliminated the problem, but in GSX you can select configure aircraft, and set it to not actually lift the aircraft on pushbacks.

      A biiig patch reworking a lot of things is also just about to drop (I'm betting on release tomorrow), so perhaps the issue will go away with that.

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      • MarkM Offline
        MarkM Offline
        Mark
        JF Staff
        wrote last edited by
        #3

        I can't see that I've experienced any sudden movement after pushback, and I can't think of anything in the product itself that would cause that. It sounds like some other product is trying to move the aircraft after pushback.

        There is a fix included in the recent v2.4 update (released today) that should prevent the brake temperature from rising when using third-party pushback tools.

        Mark - Just Flight

        Just Flight Development Assistant

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        • K Offline
          K Offline
          knidarkness
          wrote last edited by
          #4

          Hmmm, just had the same "bump & fly 50m forward" after completing GSX pushback. The brakes are OK though 🙂

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          • K Offline
            K Offline
            KosmicRavioli
            wrote last edited by
            #5

            It's odd. I think this only happens at default airports. Third-party airports with planned pushback routes for GSX does not seem to manifest this behaviour.

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            • A Avionic

              It's been a while since I've flown the 146 (waiting for 2024 variant) - not sure if I remember something like that kick in the behind, but it did certainly have some awkwardness with GSX pushbacks.

              Whenever a towbarless tug was used, the lifting action would somehow mess with the brakes, and they would aggressively heat up to +750 C. (less than ideal in case of an aborted TO!). Could this be related to what you are seeing as well (perhaps with the kick coming once the tug sets the nosewheel free again?).
              Not sure if it eliminated the problem, but in GSX you can select configure aircraft, and set it to not actually lift the aircraft on pushbacks.

              A biiig patch reworking a lot of things is also just about to drop (I'm betting on release tomorrow), so perhaps the issue will go away with that.

              K Offline
              K Offline
              KosmicRavioli
              wrote last edited by
              #6

              @Avionic said in Massive Bump From Behind During After-Start:

              It's been a while since I've flown the 146 (waiting for 2024 variant) - not sure if I remember something like that kick in the behind, but it did certainly have some awkwardness with GSX pushbacks.

              Whenever a towbarless tug was used, the lifting action would somehow mess with the brakes, and they would aggressively heat up to +750 C. (less than ideal in case of an aborted TO!). Could this be related to what you are seeing as well (perhaps with the kick coming once the tug sets the nosewheel free again?).
              Not sure if it eliminated the problem, but in GSX you can select configure aircraft, and set it to not actually lift the aircraft on pushbacks.

              A biiig patch reworking a lot of things is also just about to drop (I'm betting on release tomorrow), so perhaps the issue will go away with that.

              This is interesting. I haven't had this issue in today's flights and I thought it might have been due to both airports being paid third-party addons with pre-planned pushback routes but now that I think about it, they were both towbar pushbacks, and I actually had the same rear-end collision bump in another third-party airport (albeit not a paid one with GSX compatibility) where the pushback was done with a towbarless tug.

              So this is the answer, probably.

              Thanks.

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              • K knidarkness

                Hmmm, just had the same "bump & fly 50m forward" after completing GSX pushback. The brakes are OK though 🙂

                K Offline
                K Offline
                KosmicRavioli
                wrote last edited by
                #7

                @knidarkness said in Massive Bump From Behind During After-Start:

                Hmmm, just had the same "bump & fly 50m forward" after completing GSX pushback. The brakes are OK though 🙂

                Was it a towbar tug or towbarless tug?

                If it was towbarless, what @Avionic said is probably the culprit. Should configure for pushback without lifting.

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                • J Offline
                  J Offline
                  jmarkows
                  wrote last edited by
                  #8

                  Had something similar using Pushback express yesterday, but it might have had something to do with when I hit the brakes versus when the tug disconnected.

                  I don't think PBE specifies wheels up vs straight push, but it does use whatever default sim tug is nearby.

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