I wanted to add a short video to help this explanation but its not an allowed file type.  I had an issue with the Dynon Skyview HDX 1100. After talking at lengths with Dynon and troubleshooting, they sent a new EMS and ADAHRS-200.  The issue is that when the up or down electric trim button is pushed on either joystick, the fuel PSI, trim and flaps icons all go crazy.  In the pictures you can see that it makes the flaps go from 12 degrees to 0 degrees and the Fuel PSI goes from 2.2 to 6.0.  This was not done with the engine on.  This was simply done with the Master and EFIS 1 and EFIS 2 on. They move sporadically up and down when those buttons are pushed.  I installed the new parts and the plane did a great run up for about 20 min.  Then the same issues came back.  Since its new Dynon equipment I have a feeling its something else.  Someone said it may be a failed ECU.  


Has anyone else had these issues?  If so was it a failed ECU? What are the symptoms of a failed ECU?

8839_1_IMG_3028.jpg (You do not have access to download this file.)
8839_1_IMG_3029.jpg (You do not have access to download this file.)
  • Re: Somethings gone haywire!!

    by » 4 weeks ago

    You have a problem with something that is in common with the Flaps, Trim, and Fuel Pressure.
    They all probably share a common ground that has been compromised.
    When you press the Trim Buttons, instead of finding a Ground, they end up backflowing the current through the Flap and Fuel Senders producing erroneous displays.

    Monitor the voltage on the Common Terminal on the Trim Switch.  Press the TRIM Buttons.
    The voltage should remain at whatever it measured before you pressed the Buttons.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated.

    Thank you said by: RotaxOwner Admin

  • Re: Somethings gone haywire!!

    by » 4 weeks ago

    It seems that "hay-wire" is the apposite term in this case!  😊

  • Re: Somethings gone haywire!!

    by » 4 weeks ago

    Got everything resolved.  Two wires that did not have their metal ends completely covered were touching and causing a short.  Everything is back up and running like normal.  Thank you for your help!

    Thank you said by: Bill Hertzel

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