In early 1986 one of the piston-engined pre-production aircraft was sent to Soloy in the United States and was fitted with a 420 shp Allison 250B-17D engine.
Pada awal 1986 salah satu pesawat pra-produksi bermesin piston dikirim ke Soloy di Amerika Serikat dan dilengkapi dengan mesin 420 shp Allison 250B-17D.