Borus Aviakompania | Bureau of Aircraft Accidents Archives

After the airplane has been leased for the summer period for forest fire survey missions, the contract was ended early October and the airplane was ferried back from Verkhneusinskoye to Shushenskoye. The crew departed Verkhneusinskoye at 1605LT and maintained regular radio contacts with their base, confirming that weather conditions were good. Nevertheless, while at halfway-point, weather conditions deteriorated. While cruising in clouds, the airplane collided with tall pine trees and crashed in a dense wooded area located some 40 km southwest of Tanzybei, bursting into flames. The airplane was destroyed by impact forces and a post crash fire and both crew members were killed.

Probable cause:

The accident resulted from the PIC's loss of visual contact with ground references when entering non-VFR weather conditions, resulting in a collision with obstacles and the ground.
The accident was the result of a combination of the following factors:
- The crew's unfounded decision to conduct a VFR flight along a route through mountainous terrain, without analyzing all necessary meteorological information.
- Failure to abort the flight and to return to the departure landing site when weather conditions deteriorated below established limits.
- Flight below safe altitude in conditions of limited visibility.

Final Report:

Crash of an Antonov AN-3T in Olyokminsk: 1 killed

Date & Time: Oct 13, 2024 at 0747 LT

Type of aircraft:

Antonov AN-3

Operator:

Borus Aviakompania

Registration:

RA-05884

Flight Phase:

Takeoff (climb)

Flight Type:

Charter/Taxi (Non Scheduled Revenue Flight)

Survivors:

Yes

Site:

Airport (less than 10 km from airport)

Schedule:

Olyokminsk – Zheleznogorsk-Ilimsky – Shushenskoye

MSN:

1G109-14-2004

YOM:

2000

Flight number:

Location:

Olyokminsk

Republic of Yakutia (Sakha)

Country:

Russia

Region:

Asia

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Captain / Total flying hours:

4037

Captain / Total hours on type:

1000.00

Copilot / Total flying hours:

8814

Copilot / Total hours on type:

3128

Aircraft flight hours:

1537

Circumstances:

The single engine airplane was engaged in an on-demand charter flight from Olyokminsk to Shushenskoye with an intermediate stop in Zheleznogorsk-Ilimsky. On board were three employees of a gold mine company and two pilots. After takeoff from Olyokminsk Airport, while climbing to a height of 70-100 metres, the crew noticed that the exhaust gas temperature was abnormally high (570°C). The copilot reduced the engine power but the temperature did not decrease. Suddenly, the engine lost power and as the speed started to decrease, the airplane started to descend so the pilot attempted an emergency landing when the airplane crashed in a dense wooded area located 600 metres east from the runway 26 threshold. A passenger was killed and four other occupants were injured. The airplane was destroyed.

Probable cause:

Loss of engine power in flight caused by the failure of the exhaust gas temperature regulator (RT12-7 IIc). This led to a subsequent loss of airspeed, a descent, and the aircraft’s collision with trees and the ground.
The accident resulted from a combination of the following factors:
- Violation of the regulator repair procedures.
- Repairs of the regulator were carried out by personnel who did not have specific training.
- The captain failed to check the proper functioning of the temperature regulator after the engine was started, as required by the Aircraft Flight Manual (AFM).

Final Report: