
Soloy Conversions, Ltd. of Chehalis, WA received Supplemental Type Certificates for
installation of the Detroit Diesel Allison 250-C20 engine and adapter hardware for Hiller UH-12D and E helicopters in 1975 (as pictured). The converted aircraft were redesignated as UH-12J. From Vertiflite, May/June 1975.
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