Accident Sequence
The accident occurred during takeoff. After a takeoff distance of 430 meters completed in 26 seconds, the pilot-in-command initiated rotation at a speed of 120 km/h. The airplane continued to climb when, at a height of 10 meters, the left engine failed. The airplane continued to climb until it reached a height of 50 meters, at which point it banked left to an angle of 80 degrees, then stalled and crashed at a speed of 170 km/h not far from the runway end.
Injuries and Damage
All six passengers sustained injuries, while all three crew members were killed.
Probable Cause
The investigation determined that the left engine malfunction was caused by the failure of the 9th cylinder valve. Wrong reaction from the crew caused the speed to drop too low, resulting in the aircraft stalling and crashing. Contributing factors included poor flight organization, poor crew training supervision, and the captain's decision to take off without a flight engineer.