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Hi All,
About ten monthe ago I had to replace the regulator on my 192 UL as this was found to be the problem with the alternator not charging the battery, I came to start the engine yesterday to find the battery flat this was removed and charged overnight, when replaced the engine started OK but the voltage with the engine running tested with an AVO was only 12.2 volts with no increase with higher revs , I replaced the regulator yet again and all is now fine with running volts up to 13. 5.
why would this regulator only last 10 months? Have I got an underlining problem causing the regulator to burn out? All I have load wise is the radio and transponder, so we'll under the maximum load.
  • Re: Regulator

    by » 8 years ago


    reg/rec are usually fairly dependable unless someone does something to shorten its life. Too much or too little draw and they will have too much internal heat. Many times heat (internal or external) is a contributing if not fatal issue.
    Physical location is too hot and or poor air flow to help with cooling. Poor wiring connections (i.e. loose or grounding against some other metal, ect...)
    You can check the outside heat with a temperature strip or some sort of external measuring device.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: Regulator

    by » 8 years ago


    The Rotax regulator has an abysmal failure rate. The likely cause of these failures is Ducati’s choice of materials and assembly methods. I have not seen any electrical component fail from heat, only failed connections. Rotax’s failure has been their inability to detect a problem.

    Here is a link to an analysis of the two most recent regulator versions.

    http://www.vansairforce.com/community/showthread.php?p=964705#post964705

  • Re: Regulator

    by » 8 years ago


    Vans was causing their own issues with their mounting location. That's why they moved it into the cockpit.
    Poor wiring and poor current draw setup can also play a big part.

    For instance the Flight Design CT's with over 368 flying in the US and 1800+ worldwide don't have this issue. They have only had a couple.Many other LSA and light aircraft MFG's don't have this issue. If you believe Vans has lots of failure and others don't then that would beg a big question.

    No doubt their have been some reg/rec failures worldwide, but it isn't as bad as some on the Vans forum believes.

    Rob and Conrad,
    Do you believe there is a huge amount of Rotax regulator failures?

    I have only replaced one in 8 years.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: Regulator

    by » 8 years ago


    yes there has been a lot of failures but I agree with Roger that they do seem to follow certain models of aircraft.
    Excessive heat can damage the regulator but I think having a good ground on the regulator body is very important as the combination of dissimilar metals and electricity can quickly cause corrosion and a poor connection.

  • Re: Regulator

    by » 8 years ago


    Hi all,

    ISSOIRE AVIATION, the French TC holder of the APM20 equiped with a rotax 912A ( 80 hp ), write a SB to move the Ducati regulator out of the cabin ( now under the plane, in the air flow).
    For this plane, the high temp. was the problem, and now with the new position, it's ok.

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