| In-flight breakup|
28 March 1961
| Gräfenberg, Germany|
| 1961 President Airlines D, Aerolíneas Argentinas Flight 644, Imperial Airlines Flight 201, KLM Flight 823, TWA Flight 529|ČSA Flight 511 Wikipedia
ČSA Flight 511 was a flight operated by an Ilyushin Il-18 that crashed in Gräfenberg near Nürnberg on March 28, 1961 during flight across West Germany.
German investigation commission stated that the primary cause of the accident was a pilot error or an autopilot malfunction. Soviet investigators refused this conclusion and stated that the accident was caused by an explosion near a tail of the plane. The plane was shot down according to the Soviets. Czechoslovakia accepted the German report two and a half years after the crash.