The Piper Cheyenne 400LS, PA-42-1000 is the final development and improvement of the venerable Cheyenne line of twin turboprop business aircraft. It is derived directly from the popular III series but utilizes powerful TPE331 engines with four blade propellers which produce faster airspeeds than its predecessors! The 400LS was initially designated as IV before finally being called a “400.” This plane first flew in 1983 but was put into production through 1992 – 44 planes were delivered to customers or had been ordered at this time !!!