During the flight , the aircraft suffered a sudden deviation from its intended flightpath .
During the flight , the aircraft collided with the An - 72 chase plane before spiralling into the ground , erupting into flames ; the test crew of seven were killed .
During the flight , the aircraft suffered a sudden deviation from its intended flightpath and collided with the An - 72 chase plane before spiralling into the ground , erupting into flames ; the test crew of seven were killed .