That was the French built Nord 262, ordered by Lake Central Airlines in the mid 1960s to replace their DC3s. Within a year or so the intractable problems with their
Turbomeca Bastan engines drove the airline into bankruptcy & they were merged into Allegheny. After 7-8 yrs, Allegheny refurbished & re-engined the Nords with PT-6s & farmed them out to their commuter system as Mohawk 298s.