Pilot error is seen as the main cause of a Boeing passenger liner crash in Kazan, a source close to the investigation told Interfax.
"Preliminary data obtained from the flight recorder indicates that the plane's stall and crash could have resulted from the crew's improper conduct during an emergency," the source said.
Interstate Aviation Committee Deputy Head Oleg Yermolov said in an interview with Rossiya 24 television that a series of procedures needs to be conducted before announcing the cause of the air crash.
"The cause of an accident is established on the basis of the entire amount of data obtained and work done by the committee. It is a large amount of work, including a study of the sound data, weather reports, air traffic organization and information about the crew. Only afterwards can we propose ways to prevent such emergencies," he said.
Forty-four passengers, among them two children, and six crew were killed when a Boeing 737 passenger liner of Tatarstan Airlines crashed in Kazan on November 17.
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