PZL-Mielec AN-2

The following findings were identified:
- The documentation was incomplete as there was no insurance certificat on board, no flying permit and no CofA,
- The flight was completed with one pilot only, without any copilot,
- The pilot failed to inform ATC and the Ukraine Army about the flight and did not receive any permission to perform the flight,
- When weather conditions worsened and the visibility dropped below minimums, the pilot failed to return or to divert to the alternate airport, continued and reduced his altitude until the aircraft impacted ground,
- Weather information obtain by the pilot prior to the flight did not correspond to the actual and forecaster weather at the time of departure,
- The operation of the aircraft with the ASh-62IR engine (s/n K1641652 was prohibited.

Most probably the accident with and An-2 RA-33589 aircraft was caused by aircraft beyond stall angle of attack entry during dynamic turn for emergency landing with reverse runway heading due to engine failure after take-off at low-altitude followed by shaking and its power loss resulted in aircraft ground impact with bank angle more than 60°. Engine failure was caused by high-temperature damage and destruction of cylinder-piston group details due to it inadequate technical operation and using motor gasoline in aircraft fuel flow system which quality didn't comply with requirements for preferred AI-95 gasoline in accordance with aeronautical equipment flight service evaluation program, Order of Ministry of Transport of the Russian Federation № НА-131-р from April 11, 2001 and engineering solution № АБ-1236-2003 from May 22, 2003. Most probably the contributing factor was partial skill loss of An-2 aircraft control by aircraft pilot in command (PIC). Flight operation was performed by PIC, meteorological minimas and which authorizations written in Private-Pilot License and the fact of medical flight-expert commission procedure were not documented. PIC's decision to perform straight-ahead landing most probably didn't allow to reduce the severity of accident consequences.

Engine failure in flight following a loss of oil pressure.

It is believed that the airplane was flying at low height when its left lower wing impacted tree tops. The aircraft then rolled to the left to an angle of 90° and crashed, bursting into flames. At the time of the accident, the pilot and other occupants were intoxicated.

The following factors were identified:
- The crew did not use the entire runway length for the takeoff procedure (577 metres instead of the 768 metres available),
- The decision of the crew to reject takeoff was taken too late,
- The wind direction changed during the takeoff procedure and became a tailwind component.

Failure of the crew who selected an unsuitable terrain for an emergency landing (rough terrain) and did not take into consideration the wind component.

The cause of the accident without casualties to the plane An-2 RA-81514 was a violation of the established safe obstacle clearance in the performance of aviation-chemical works, which led to a collision with the lightning protection wire transmission line and the ground. A contributing factor was the performance of an incomplete flight crew. According to the An-2 Flight Manual the minimum crew for aerial chemical works is the commander of the aircraft and a copilot.

The accident was caused by a loss of engine power because the aircraft has been refueled with fuel dedicated to automobile.
The following contributing factors were identified:
- The pilot's lack of knowledge about the flight area and the layout of cultivated fields,
- The pilot failed to brake properly during the emergency landing,
- The absence of a copilot on board,
- The Operator certificat was revoked 3 days prior to the accident.