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.
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