Cessna designed the Model 340 as a step-up for Cessna 310 owners who want a pressurised cabin and the comfort of a larger passenger area and an airstair door. Powered by either 285 or 310 hp Continental TSIO-520 engines, the six-seat Cessna 340 is a desirable personal twin and was built from 1972 to 1985. The Cessna 335 is an unpressurised version.