From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Date: Sun, 21 Dec 2025 19:53:29 -0500
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Subject: Re: [FlyRotary] EC2 "A" Computer failure
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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One difference is that the A controller has the temp sensor. At one 
point there was a revision that made it impervious to shorted sensor. 
Don't remember what happened when it shorted prior to that revision.

Finn

On 12/21/2025 5:06 PM, Doug Lomheim rv9flyer13b@gmail.com wrote:
> Have any of you ever lost the “A” side of EC2?  I went to start the 
> R7A w/Renesis yesterday and it wouldn’t fire right off as before. 
>  Switched to the “B” side and it fired right up.  EM2 rpm was 
> alternating between the actual RPM and NOP displaying.
>
> Will of course have to begin troubleshooting this outage, but wondered 
> if any had seen this before, and where the fault lied?
>
> thx.
>
> Doug
>
> RV-7A w/Renesis 13B (Dennis Haverlah build w/1019 hrs now!)
> RV-9A w/13B (7 hrs. of ground runs)


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    <div class="moz-cite-prefix">One difference is that the A controller
      has the temp sensor. At one point there was a revision that made
      it impervious to shorted sensor. Don't remember what happened when
      it shorted prior to that revision.</div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">Finn <br>
    </div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">On 12/21/2025 5:06 PM, Doug Lomheim
      <a class="moz-txt-link-abbreviated" href="mailto:rv9flyer13b@gmail.com">rv9flyer13b@gmail.com</a> wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:list-4471653@logan.com">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <font size="4" class="">Have any of you ever lost the “A” side of
        EC2?  I went to start the R7A w/Renesis yesterday and it
        wouldn’t fire right off as before.  Switched to the “B” side and
        it fired right up.  EM2 rpm was alternating between the actual
        RPM and NOP displaying.  </font>
      <div class=""><font size="4" class=""><br class="">
        </font></div>
      <div class=""><font size="4" class="">Will of course have to begin
          troubleshooting this outage, but wondered if any had seen this
          before, and where the fault lied?  </font></div>
      <div class=""><font size="4" class=""><br class="">
        </font></div>
      <div class=""><font size="4" class="">thx.</font></div>
      <div class=""><font size="4" class=""><br class="">
        </font></div>
      <div class=""><font size="4" class="">Doug </font></div>
      <div class=""><font size="4" class=""><br class="">
        </font></div>
      <div class=""><font size="4" class="">RV-7A w/Renesis 13B (Dennis
          Haverlah build w/1019 hrs now!)</font></div>
      <div class=""><font size="4" class="">RV-9A w/13B (7 hrs. of
          ground runs) </font></div>
    </blockquote>
    <p><br>
    </p>
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