Czechoslovak Airlines (ČSA) Flight 511 was a flight operated by an Ilyushin Il-18 that crashed in Igensdorf near Nuremberg on 28 March 1961 while flying across West Germany.
A German investigation commission stated that the primary cause of the accident was pilot error or an autopilot malfunction. Soviet investigators dismissed this conclusion and stated that the accident was caused by an explosion near the tail of the plane.