The Cessna 400, marketed as the Cessna TTx, is a single-engine, fixed-gear, low-wing general aviation aircraft built from composite materials by Cessna Aircraft. The Cessna 400 was originally built by Columbia Aircraft as the Columbia 400 until December 2007. From 2013, the aircraft was built as the Cessna TTx Model T240. Cessna 400 production was ended in February 2018. Design and development The Cessna 400 was derived from the normally aspirated Columbia 300, which in turn was derived from the Lancair ES kit aircraft. The 400 is powered by a turbocharged Continental TSIO-550-C engine producing at 2600 rpm. The 400 features a Garmin G1000 glass cockpit that was later incorporated into the 300 to create the Cessna 350. The 400's Continental TSIO-550-C engine is capable of being operated lean of peak. Measured in flight at , rich of peak turbine inlet temperature, maximum cruise yielded true air speed and per hour fuel flow. At the same operating parameters and lean of peak the 400 was measured at TAS and /hr (106.8 lb/hr, 67.6 L/hr). In a 2006 review, Richard L. Collins of Flying magazine said of the 400: The Columbia 400 was marketed with an optional ice protection system, known as E-Vade that was not certified for flight into known icing. The system consists of heat-conducting graphite foil panels on the wing and tail leading edges. These panel areas are heated by 70 volt 100 amp electrical power delivered from a dedicated alternator. The system is controlled by a single switch. The 400 features optional speedbrakes mounted on the wing's top surfaces. The 400 nosewheel is not directly steerable; directional control while taxiing is accomplished using differential braking on the mainwheels. Initially sold simply as the Cessna 400, the aircraft was given the marketing name Corvalis TT for twin turbocharged by Cessna on 14 January 2009. The name is a derivation of the town of Corvallis, Oregon which is west of the Bend, Oregon location of the Cessna plant that built the aircraft, prior to closing the plant and relocating production to Independence, Kansas in 2009. In April 2009 Cessna announced that it would close the Bend, Oregon factory where the Cessna 400 was produced and move production to Independence, Kansas, with the composite construction moved to Mexico. The production line was restarted in October, 2009 in the Cessna Independence paint facility, at a rate of one aircraft per six