As Beechcraft King Air 350 production passed 4,000 units, the manufacturer faced a drop in demand for the original turboprop high-speed business jet. After analyzing the markets of Canada and the United States, Hawker Beechcraft Company came to the conclusion that there was a shortage of conventional 16-seat passenger aircraft of domestic design and, as a bold experiment, decided to immediately convert 50 Beechcraft King Air 350 business turboprops already in stock from luxurious six-seat long-range airliners into prosaic 16-seat passenger short-range turboprop aircraft. The modernization was very simple: balancing fuel tanks were removed from the aircraft, reducing the fuel supply, and the layout of the seats in the passenger cabin was changed by installing 8 rows of seats in a 2 + 2 layout. This simple upgrade proved to be commercially successful despite a short range of 1,000 nautical miles; profits from the mass sale of Beechcraft King Air 350 converted into passenger versions allowed the engineers of the Hawker Beechcraft Company to order new economical turboprop engines from Pratt & Whitney, supplemented by more high-torque propellers, which reduced the takeoff and landing distance, increased cruising speed and returned almost the original flight range (1700 nautical miles). compared to 1850 nautical miles for the business version with four fuel tanks). Installation instructions in the archive. Have a nice flight!