Prototype of Polish twin-engined small regional airliner, developed by Centralne Studium Samolotów (Central Aircraft Study) in Warsaw. A single example was built and flown in 1950, but no production followed. It was the first all-metal aircraft to be built in Poland following the end of the Second World War. After the plane was scrapped in 1960, most of the plane ended up in a children's playground in Warsaw. Only the front part of the fuselage survived and in 1967 it was transferred to the collection of the Museum of Aviation and Astronautic in Krakow.