Accident
A single-engine cargo airplane departed Koryaki on a flight to Tymlat, carrying two pilots and a load of potatoes and roof tiles. Shortly after takeoff, during the initial climb, the airplane reached a critical angle of attack, entered a stall, and crashed in a wooded area, bursting into flames. The wreckage was found approximately one kilometer from the village. The airplane was totally destroyed by a post-crash fire, and both occupants were killed.
Investigation
The official investigation determined the probable cause and contributing factors of the accident. The airplane had taken off with the maximum permissible weight and reduced power from the propulsion system.
Probable Cause
The accident probably occurred as a result of the airplane entering subcritical angles of attack and a stall mode after a takeoff with the maximum permissible weight and reduced power of the propulsion system. Most likely, the reduced power was due to the installation of a magneto switch prior to the PM-1 magneto switch to position “1” instead of position “1+2” as required in the flight manual.
Contributing Factors
The investigation identified the following contributing factors: long flight interruptions of both crew members before the emergency flight, deficiencies in the training and interaction of crew members, and an insufficient level of flight training, which resulted in a loss of control of the flight speed.