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Hey Dan: I ran across the info on the C-90 conversion. N 2860H was
converted in December 1953 and approved in Jan 1954 and again in June 1954 (it
was also converted to a 415-D). N 3658H was converted in July 1959 using the
information from N 2860 as a reference.
I hope that this is what you were looking for. I
have been told that when you submit any 337 as a reference, that was approved
prior to 1956, you do not need FAA approval, or an STC to make the
installation.
Lynn Nelsen
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