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I have not put a C-90 in yet, but I have found out from my local FAA
inspector that if you reference an installation of a C-90 that was done prior to
1956, you do not need the STC. Apparently the inspectors prior to 1956 were
engineers, and when they approved an installation, that approval could be used
as engineering data. I do not recall the N numbers, but when I asked the
question last year, I was given the N numbers of a couple of C-90 Coupes, and
they were modified prior to 1956. I do have the data around here someplace, but
I can not remember where I put it, or put my hands on it right now.
I believe the C-90 is the best engine to have in
your Coupe.
Lynn Nelsen
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