Two-seat jet bomber powered by two RR Nene engines. Rolled out on 5 March 1950. The landing gear collapsed during taxiing tests on 23 April and, after repairs, again on landing after the aircraft's first and only flight on 15 March 1951. The French defence ministry had already cancelled the type in May 1950. The sole SO.4000 ended up as a target at a shooting range near Bourges. According to some sources the type was named Vautour I. Photo from: Sud-Ouest