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Ground Friction Problem

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    Ground Friction Problem

    Hello all

    I am having a problem that after I have landed and exited the runway there seems to be a huge ammount of ground friction. It takes 90% N1 to get and keep moving. WHen I am moving the speed goes up rapidly. I thought this may be a scenery problem as it first happened at Aerosoft GCTS but it happened again mid taxi at EGKK. I also have no autobrakes on landing which ever setting I use 1,2 or 3, I have to manually break. The amber light above the autobreak does come on until I turn the autobreaks off.

    I also have another problem, which is probably me not setting something correctly, but, when I am on approach I get an amber Single Channel message on the PFD. Both FDs are on, I have tried putting the ILS freq in both nav radios. Landing flap/spd is set in the FMC. Fail Pass set in the options menu.

    Another thing I have noticed is vertical lines on the EICAS upper and lower and FMC. They flash RGB and white. More annoying more than anything.

    Sorry few things there but saves making another topic. I have tried searching for ground friction but no topics that I could see only 777.

    System

    Windows 10 Home 19041.985
    AMD Ryzen 5 3600XT
    AMD Radeon 5700XT

    P3D v5 Pro (probably the most up to date as only bought and downloaded a few days ago) using ASN for P3D

    Thanks
    Matthew
    Matthew Moore

    #2
    Hi Matthew

    First I thought you might have blown your tires (always worth check in the failures menu in the CDU) but when you went further with the autobrakes not working it looked more like you have your brakes always applied a bit. Do you use rudder pedals with brake axes? If so, please check the calibration and if necessary set a null zone.

    the whole picture however with the PFD and EICAS COULD also be a faulty panel state. You can try that by starting the 737 with the default panel state (engines running) and go on from there. If everything is fine then you should trash the previously used panel state and save a new one. Apart from that I can‘t tell you anything else, you‘ll have to wait until the 737 experts chime in.


    and beside all that... please set up a signature with your full name or sign your posts with it as required by PMDG. Thanks
    i7-6700k, GTX 1080TI, 32GB DDR4 RAM @2666MHz, 4k
    Marc Ehnle

    Comment


      #3
      I dont have rudder pedals I have the Hotas Thrust master. I am using the default Short Ground Turn panel state. The only time the breaks are on (I think) is when I depress the trigger on the stick as the red Break sign appears bottom left of screen.

      Signature done😁
      Matthew Moore

      Comment


        #4
        Is this problem reproducable?

        I know that for example at Aerosofts EDDF there is one runway exit missing in the AFCAD, resulting in your aircraft believing that it is on grass rather than asphalt, thus causing taxi problems.
        If you can reproduce the problem at the same spots on the same airports it might be just this, an AFCAD problem.

        Comment


          #5
          No, on the same taxiways the a/c is fine.
          Matthew Moore

          Comment


            #6
            Originally posted by BoeingBonkers View Post
            Hello all
            I also have another problem, which is probably me not setting something correctly, but, when I am on approach I get an amber Single Channel message on the PFD. Both FDs are on, I have tried putting the ILS freq in both nav radios. Landing flap/spd is set in the FMC. Fail Pass set in the options menu.
            Welcome to the forum.
            The ground friction in FS/P3D is one of those things that is just never right. The sim has a huge limitation there and airplane developers can do nothing but chase the changes that the Sim developers do. It's something we have to live with. I've never needed thrust as high as 90% to start rolling. But 30-35% N1 will get the real 737 rolling easily on a flat smooth platform and then it'll maintain speed on a straight line with short bursts of thrust every now and then. The 737 is not like other airplanes that will easily start rolling and even accelerate on idle thrust but it's definitely not as sticky as in P3D. In fact, IRL if we ever need more than 35% N1 to start rolling on the apron, we'll inform ATC.

            Regarding your ILS thing. That's what it's supposed to do. You're doing an ILS on a single autopilot. Flare mode will not be available and the go around will be manual. In single channel you can use the autopilot all the way down to the Minimum Use Height (MUH) of 158ft. After that, you need to disengage and fly manually. The other option is to engage both autopilots right after you arm approach mode to do a dual channel approach. It's all explained in the FCOM.

            Here's a single channel ILS and Go Around video I did some time ago. Ignore the "too low gear" after go around until 500ft RA. That's a reported bug.
            Last edited by Aeromar; 02Jun2021, 09:22.
            Omar Josef
            737 FO
            757/767 rated
            Spain

            Comment


              #7
              Thanks for your reply. I did have both CMD A and B engaged though. Same in the CS 737 both autopilots engaged and only 1 channel. (EDIT: Sorted after watching video) Thank You Omar.

              I purchased the CS 737-300 and the Vertical lines are present on that aswell (Maybe graphics card update needed) also the autobreaks do not function. (EDIT: They just go straight to disarm) Maybe I need to reinstall P3d? I will do a full flight in the CS 737 and see in the friction problem occurs again.
              Last edited by BoeingBonkers; 02Jun2021, 08:53.
              Matthew Moore

              Comment


                #8
                The fact that your autobrake is immediately showing the autobrake disarm light is a good reason to suspect a bad brake axis. Make sure your brakes are zeroed when not acting on them.

                Omar Josef
                737 FO
                757/767 rated
                Spain

                Comment


                  #9
                  In general aviation I believe it is good practice to tap the brakes before retracting. Do you do this in a 737? Because I did notice the breaks applied for a split second while I was retracting my gear on a test I have just done. (CS737) If its not meant to do that then it must be a axis issue like you said. I will look into it maybe something to do with FSUIPC. Although I'm rusty as I have been out of the simming game for 6 years!
                  Matthew Moore

                  Comment


                    #10
                    I see no one mentioned it, if it takes nearly full power to move aircraft after landing this indicates that the brakes have melted (in ngxu obv). If you believe your landing rollout (rollout distance) was normal then it's very likely that the panel state you're using is corrupted. I'd start with not using ANY* panel state next time you fly.
                    Also there was a bug where heat was incorrectly accumulated in brakes which could result in a melting literally at any stage of flight, for example when taxxing to runway for departure.
                    Last edited by Dzosef; 02Jun2021, 11:19.
                    Matthew Chalupniczak

                    Comment


                      #11
                      https://forum.pmdg.com/forum/main-fo...roblem-taxiing

                      Found that on google. I think it is the brakes. Only thing left is the autobrakes I am thinking FSUIPC or throttle position on landing.

                      One question does the red brakes sign have to appear or does pmdg use some internal logic to break with autobrakes?
                      Last edited by BoeingBonkers; 02Jun2021, 14:15.
                      Matthew Moore

                      Comment


                        #12
                        Originally posted by BoeingBonkers View Post
                        One question does the red brakes sign have to appear or does pmdg use some internal logic to break with autobrakes?
                        I think PMDG uses some internal logic with the autobrakes, but then again, I don't ever have the brake warning showing up anyway. On the actual plane, you wouldn't have any such warning on the bottom left corner of your screen.
                        Captain Kevin

                        Kevin Yang

                        Comment


                          #13
                          Sorted. I deleted the FSUIPC.ini file and I think it does use an external method of braking (Breaking, I swear I'm dyslexic) so the red memo would not show in that case until I press the toe brakes and disc the autobrake. That coupled with the fact in the NGXu I believe the braking is less powerful. I read another topic where someone was complaining about it and how its more realistic this way when you compare it to the calculated stopping distance. I guess the taxi problem WAS because I used the toe brakes to slow (Frying the discs), assuming that the autobrakes were not working because I couldnt see the message and it was taking longer to stop. Thanks for all your replies and yes I am rather thick😄

                          On a side note the NGXu is wonderful to hand fly. Sometimes with other aircraft I kind of dread disc the autopilot at 1,000 because of the flight dynamics. I disc the ap on the NGXu before the g/s. I usually find some nagging thing about an addon but I really cant fault the NGXu. Roll on payday I think ill treat myself to a 777...😊 and the CS 737 I bought good eye candy but not struck on it.
                          Matthew Moore

                          Comment


                            #14
                            Originally posted by BoeingBonkers View Post
                            In general aviation I believe it is good practice to tap the brakes before retracting. Do you do this in a 737?
                            Yeah. I used to do that in GA airplanes. We don't do it in large airplanes. In the wheel well there's a device that stops wheels on retraction with a material cheaper than brake disks.
                            Omar Josef
                            737 FO
                            757/767 rated
                            Spain

                            Comment

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