A friend and I researched every last 0200 equipped 415 we saw for a while.  
Although most were actually converted D models with the STC, I did find a few C 
models with 0200 installations.  One just used the STC, which in my opinion was 
not valid, since the STC clearly stated it was for a D model.  Two were done 
with nothing more than a 337 stating simply "removed C75 and installed 0200 
engine".  I suppose that satisfied the owner, but quite questionable in my book.
I do agree that using the STC directions for the D model, and upgrading to the 
1320 GW STC, would be an almost automatic approval, I am an A&P and had decided 
I would attempt it in that method if I found a good 0200 laying around.  I have 
since decided that the 0200 crank/pistons upgrade to my C85 will be the route I 
follow.  It seems to me that the 0200 is not all that powerful, and seems to 
use a lot of fuel for the HP, and the crank and piston conversion does a better 
jub.  This is my opinion only, comments of people who have been there, done 
that welcomed!

, --- In [email protected], "Ed Burkhead" <e...@...> wrote:
>
> 
> Geri,
> 
> You should still be able to post messages to the forum.  This is an
> excellent example of one that should go to the forum.  I'm not any kind of
> mechanic and must not play one on the Internet.
> 
> I'll post this response and hope that others will read and respond to your
> questions with more definitive information.
> 
> Several 415-C and 415-CD aircraft have gotten field approval for the O-200
> engine on 415-C and 415-CD aircraft using this process.  I don't see any
> copies of the approved form 337 for this on the EOC web page, though.
> 
> As far as I know, you should be able to get field approval by citing the
> O-200 STC as "approved information" (or some such official phrase).  I
> **think** that you need to buy the STC to be able to use it for that purpose
> - I don't know for sure.
> 
> The O-200 STC was written for 415-D models.  You DO NOT have to make your
> plane into a 415-D, though.  You will get your own field approval via a form
> 337 using that "approved information" as proof of its safety.
> 
> It may grease the approval process if you also buy and apply the 1320 pound
> gross weight STC.  This STC requires that you make all the changes to the
> aircraft which would be made for a "D" conversion, but WITHOUT making it a
> "D."  This keeps the LSA eligibility and you get to legally carry up to 1320
> pounds gross weight.
> 
> I'd urge you to contact Skyport and discuss the issue with them.
> http://ercoupeparts.com
> 
> Also, please watch the forum mail for a day or two and you'll most likely
> get definitive information from one or more forum members.
> 
> And, please, try posting to the forum yourself by sending mail to
> [email protected] or (if you are a flyin member) to
> [email protected] 
> 
> We're very happy to help.  I predict success!
> 
> Ed Burkhead
> 
> > -----Original Message-----
> > From: geri [mailto:jggri...@...]
> > Sent: Sunday, February 28, 2010 10:41 AM
> > To: Ed Burkhead
> > Subject: 0200engine
> > 
> > Hi Mr. Burkhead,
> > 
> > I am a coupe owner and I receive the tech e-mails daily.  I never fully
> > registered with yahoo.
> > 
> > I was wondering if you could give me some suggestions on acquiring
> > field approval to put an 0200 on a 415C or CD.  I want to maintain the
> > 415C-CD status, not "upgrade" to the D model.
> > 
> > Are there any field approvals posted in the archives somewhere?
> > 
> > I have looked through the FAA site on STC's for Ercoupes and of course
> > find the C90 and the D model STC's.
> > 
> > We have a newly rebuilt 0200 that my husband would like to put on my
> > Ercoupe to replace it's C75.  This engine was on a G model previously
> > and I am familiar with the STC required to do so.
> > 
> > I have the paperwork for this STC, therefore I know what is required to
> > make the change, but I don't want to lose the sport pilot capabilities
> > of my airplane.  I'm not getting any younger.
> > 
> > I have talked with the fellas that hold most of the Ercoupe STC's and
> > it doesn't seem like a C model STC is going to be available for quite
> > sometime.  I think I'm going to need a field approval and I would like
> > to get some information
> > from someone who is more familiar with this than I am.  My local FAA
> > office wasn't much help.
> > 
> > Do you know someone who has acquired a field approval for this change?
> > Or do you have any info posted in the archives somewhere?
> > 
> > 
> > Any suggestions?  Thank you for all your efforts on behalf of us
> > Ercoupe owners,  Geri
> >
>


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