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FMC Route tracking

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    FMC Route tracking

    Need help,

    What will cause my PMDG AC (737, 747, 777, did not try with other ACs) following a route on the FMC, but it flies making turns (left and right) following a route, in the FMC. The turns are about 45 degrees to the left, and it turns right 45 degrees past the flight path on the FMC. It does follow the route, in the FMC, but making turns on and off during the route. This just started recently, about a month ago more or less. I have not did nothing that, I have done for the 6 years more or less. Any help with this would be greatly appreciated. Thanks in advance!

    Ronny Whaley UAL103
    Last edited by rwchicago; 02Dec2019, 17:52.

    #2
    Originally posted by rwchicago View Post
    Need help,

    What will cause my PMDG AC (737, 747, 777, did not try with other ACs) following a route on the FMC, but it flies making turns (left and right) following a route, in the FMC. The turns are about 45 degrees to the left, and it turns right 45 degrees past the flight path on the FMC. It does follow the route, in the FMC, but making turns on and off during the route. This just started recently, about a month ago more or less. I have not did nothing that, I have done for the 6 years more or less. Any help with this would be greatly appreciated. Thanks in advance!

    rrwhaley UAL103
    Welcome to the PMDG forums, please note the rules you agreed to when joining include signing our full name on all posts.

    Lots of information missing in your problem description. If the aircraft is not flying a segment to a waypoint but is wandering around my first question is what does the FMA indicate and second what is the weather/winds? Could also be a trim issue but if it is happing in all three products then you are going to start looking at your controller hardware and calibrations. Like I said... lots' of information missing.
    Dan Downs KCRP

    Comment


      #3
      Fly-By waypoints would be common in all the PMDG aircraft routes.
      Vaughan Martell KDTW

      Comment


      • DDowns
        DDowns commented
        Editing a comment
        I interpreted his problem description to mean he was flying s-turns along the route instead of a constant track.

      • rwchicago
        rwchicago commented
        Editing a comment
        Exactly, what was happening

      #4
      Hi, Dan:

      Going to replace my joystick, which I had for years. So that it's due, for sure. I'll get back afterwards. More infor. Example of my last flight SFO-EWR. Flying the PMDG 773. Flying east I had a tail wing, with a 522 knot speed, with is normal. No problems till in get half way thru KC airspace. Then this issue comes. No problems flying CaptainSim, or QW (all three version of the 787 and 757) Weather, has not been an issue, even thou I have been using REX for ages. It does not gain or lose altitude, only due to weather changes. I only fly payware AC, and I basically have all of them. Trim has never been an issue, as I can do that as I fly, especially on TO & Landing. Trying to think of anything else. Seems like I had this issue years ago, do not now what I did to correct it.

      Ronny Whaley UAL103

      I did fly real world, a PP with and Instrument Ticket, since 1976,
      Last edited by rwchicago; 02Dec2019, 18:29.

      Comment


        #5
        I experienced a similar problem a few years back. I was flying in FSX then. I posted some cockpit screenshots of the "S" turning behavior and a keen eyed forum participant noted that the yaw damper was showing hard over rudder and suggested that I might have a hardware controller problem. Sure enough, when I went to calibrate my joystick (MS FFB Pro) the rudder axis was spiking all over the place. I replaced the joystick with a Thustmaster T16000 with Hall Effect sensors and have never had that problem again.
        Jeffrey Williams

        Comment


          #6
          Thanks for your info. More and more that's what I think. Had this problem way back in the day. Telling my age, LOL! Going to replace my Stick.

          Thanks everybody.

          I am closing and saying this is solved.

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