The Swearingen Merlin, or the Fairchild Aerospace Merlin, is a pressurized, twin turbo prop business aircraft first produced by Swearingen Aircraft, and later by Fairchild. The improved and slightly larger Merlin III combined the Merlin II’s fuselage but stretched it slightly and added a new tail and more powerful engines.
Production of the Merlin IIIA ended in favor of the SA226-T(B) Merlin IIIB. The IIIB differed mainly by TPE331-10U engines of increased power driving four-bladed propellers turning in the opposite direction to those of earlier models. The SA227-TT Merlin IIIC was next, introduced concurrently with the SA227-AC Metro III. The Merlin IIIC was a redesign to incorporate structural and other changes but was visually the same as the Merlin IIIB.