The flight manual and crew training programs did not provide instruction on manual pitch control and pitch trim during high-altitude flight.
There were 160 passengers and 10 crew members aboard the aircraft.
Among the passengers, 115 were adults and 45 were children under 12 years old.
The aircraft belly-flopped into a swampy area and disintegrated on impact.
The search for the black boxes, which was interrupted for the night, concluded the following morning when both recorders were found and subsequently transported to Moscow for analysis.
Among the adults, 8 were over 60 (including a 92-year-old woman who flew with one of her grandsons and his wife and two of her great-grandchildren).
Earlier reports by the media and by the airline indicated that 159 passengers were on the flight, 39 children under 12 and six infants under 2 years of age.While avoiding areas of thunderstorms and turbulence, the crew allowed the aircraft to enter pitch oscillations exceeding the angle of attack operational range.Lack of control over speed and not following the Flight Manual to prevent and recover from a stall and poor crew resource management allowed the situation to escalate into a catastrophic one.According to the residents of a nearby town, the weather at the time of the crash was violent enough to cause power outages and cell phone disruptions on the ground.Authorities on the scene have speculated that the aircraft was struck by lightning which may have initiated an onboard fire. Based on various information, including the partially deciphered information from a recovered flight recorder, crash investigators believe that the aircraft climbed to an altitude higher than the maximum for which it was designed, causing the aircraft to enter into a flat spin from which it never recovered.Some other sources reported that the plane was carrying 171 people.