On June 3, 1973, a Tu-144 crashed at the XXX Paris International Air Show in Le Bourget during its demonstration flight. This happened near the town Goussainville, six and a half kilometers from the airport of Le Bourget.
The commission investigating the causes of the catastrophe did not identified any malfunctions of the airplane. There were several hypotheses about human factors that perhaps led to the crash. However, once all of the facts were found, there was no evidence either to reinforce or disprove these suppositions. In these circumstances, the commission and the Soviet experts came to the conclusion that the causes of the accident should be declared as not defined, and the case was closed.