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I have an 06 model 912ULS, Started having start problems. For a while if i started it every day
It would start fine, but if i waited 2 or 3 days no spark.(From either side) I would remove the plugs and Ground them out on the engine to prove this. I read somewhere that heat applied to the module would produce Spark.I tried and it worked. After talking to a rotax mech i heard i was a first, that most folks put a ziplock bag of ice on the top module and that also will do the job. Guess what: I tried and it works!
Aircraft has been down over a month cant get the new advanced soft start module kit from Rotax Still
Back ordered.Engine has 350 Hrs. My question is there is a known problem out there with a certain batch
Of modules, people are starting & flying in this manner which I dont think is the prescribed manner.
What does it take for Rotax to initiate a service bulletin or an alert service bulletin on this matter.
At the price of theses modules it would be nice if they treated them like fuel pumps.
Anyone out there with this problem.
  • Re: Ignition Module Failure

    by » 11 years ago


    Hi Walter,

    What has been killing some modules is high heat under the cowl. It usually isn't from the flying part, but after shutdown and the modules just sit and heat soaks and there is no cool air coming in and the temps rise for a while before they start to cool. The magic number to look for is nothing over 175F. For those who want to check just buy some self sticking heat strips and put one on the modules. Use one from around 150F to 210 F. The white dots on the strip will show up black if the temp goes beyond the individual temp numbers. I have a heat strip on my Flight Design CTSW and it has never popped the 150F.

    There can of course be other reasons for a failure. They are after all human built.

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


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