Aeroflot flight SU1492 departed Moscow (SVO) for Murmansk at 15:03 UTC (18:03 local time). At 15:09 UTC the aircraft squawked 7600, which indicates a radio communications failure on the aircraft. At 15:26 UTC on approach to Moscow the aircraft changed to squawking 7700, which indicates a general emergency. At 15:30 UTC the aircraft touched down again at Moscow (SVO) trailing a large fireball.