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… Allison models 250-C18, -C20, -C28, -C30 including -C30R and -C30R/1, -C20R, -B15, -B17, and -B17F series engines A recent incident occurred in which … a Bell 206B helicopter was forced to jettison a slung load and enter autorotation after the Allison 250 C20 engine …
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