Flight Planning and Refueling
On 27 September 2012, an Antonov An-2, registration RA-33601, was scheduled for a passenger and cargo flight from Surgut to Sarampaul, Arbynya, and Ivdel. Per the pilot-in-command's instructions, the aircraft technician refueled the aircraft with 1000 liters of fuel. Considering the estimated residual fuel, the total fuel on board amounted to approximately 1200 liters. After refueling, the technician climbed onto the wing surfaces, verified the fuel level at the filler neck screens, and closed the filler caps. The technician did not check the quantity using the fuel gauge.
Passenger transport was documented via a list, but baggage and cargo were not documented. The pilot-in-command did not undergo pre-flight medical examination, despite the availability at the departure aerodrome. Before departure, weather information was obtained from the duty forecaster at Surgut Airport; the weather corresponded to the forecast and did not impede the flight.
Flight on 28 September 2012
On 28 September 2012, the pilot-in-command, without a co-pilot, performed the flight from Surgut to Sarampaul. Landing at Sarampaul Aerodrome occurred at 14:00. According to the pilot, the fuel remaining after landing was 580 liters. No refueling was performed after this flight.
Flight on 29 September 2012
On 29 September 2012, in accordance with the plan, at 01:43, the pilot-in-command, without a co-pilot, took off for the flight from Sarampaul to Arbynya to Ivdel. In addition to the pilot, four passengers were on board. At 03:16, the aircraft landed at Arbynya Heliport (г.т. Арбынья). According to the pilot, the remaining fuel after landing was 250 liters. At 03:40, 24 minutes after landing, the aircraft took off from Arbynya for the flight to Ivdel, located 164 km away.
Approximately 60 km into the flight, the critical fuel level warning lamp for the right wing illuminated. The source does not describe the subsequent events, aircraft condition, or any injuries.