Russian investigators have commenced the analysis of flight recorders retrieved from the Ural Airlines Airbus A321 which came down in a field outside of Moscow Zhukovsky airport.
The Interstate Aviation Committee says the cockpit-voice and flight-data recorders both captured information about the 15 August flight.
"Decryption and analysis of these recorders is being carried out," it adds.
French counterpart BEA is participating in the inquiry, representing the state of aircraft and engine developer, and a representative from the UK is also taking part because the aircraft (VQ-BOZ) was registered in Bermuda.
The federal Investigative Committee says it is waiting for the results of the recorder analysis, which will contribute to its own routing criminal case.
Fuel samples have been drawn and technical documentation is being examined, it says, and an effort is under way to assess the "ornithological situation" – and the work of related services – at the time of the accident.
The landing in a cornfield occurred after the aircraft lost power in both engines after sustaining a bird-strike, according to the airline.
Cockpit and cabin crew, and most of the passengers on the jet, have been interviewed and documents on the provision of medical assistance have been sought.
It adds that it will take into account information drawn from video images taken by passengers during the flight.