Tomsk | Bureau of Aircraft Accidents Archives

En route from Kedrovy to Tomsk, while cruising at an altitude of 12,000 feet in icing conditions, both engines failed simultaneously. The crew tried to restart both engines, without success. In such conditions, the crew reduced his altitude and attempted an emergency landing in the taiga. Upon impact, the flipped over and came to rest upside down. The wreckage was found around 1430LT some 52 km southeast of Kedrovy. All 17 occupants were found alive, among them few were injured. The captain broke one of his leg. The aircraft was damaged beyond repair.

Probable cause:

The accident of the An-28 aircraft, registration RA-28728, occurred during a forced landing on an improvised landing site due to the simultaneous shutdown of both engines while in flight. The need for this landing was triggered by the engines' spontaneous shutdown. The shutdown occurred while the aircraft was flying in icing conditions with the Pitot-Static System (POSS) turned off due to ice ingestion into its air intake.
The aviation incident was most likely influenced by the following factors:
- The crew's failure to follow the Aircraft Flight Manual (AFM) procedures for manually activating the POSS when meteorological conditions favored icing;
- Violation of the crew's duty and rest time regulations, which could have led to the accumulation of operational fatigue and contributed to missing the operation to activate the POSS;
- The crew's failure to make the decision to cease further performance of their duties due to the accumulation of operational fatigue in the absence of the airline's established procedures for exercising this crew right, which does not comply with the provisions of the Russian Ministry of Transport Order No. 139 dated November 21, 2005, "On Approval of the Regulation on Features of the Work and Rest Time Regime for Crew Members of Civil Aviation Aircraft in the Russian Federation";
- Increased hypoxia stress when flying at altitudes exceeding 3000 meters without the additional use of oxygen, which is a violation of the regulations of FAP-128, AFM, and the airline's internal regulations, and could have exacerbated the negative effects of operational fatigue;
- A malfunction in the ice detection sensor DSL-40T, which prevented the issuance of ice detection alerts and the automatic activation of the POSS.

Final Report:

Crash of an Antonov AN-24RV in Strezhevoy: 7 killed

Date & Time: Jul 11, 2011 at 1156 LT

Type of aircraft:

Antonov AN-24

Operator:

Registration:

RA-47302

Flight Phase:

Landing (descent or approach)

Flight Type:

Scheduled Revenue Flight

Survivors:

Yes

Site:

Lake, Sea, Ocean, River

Schedule:

Tomsk - Surgut

MSN:

5 73 103 02

YOM:

1975

Flight number:

IK9007

Location:

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Captain / Total flying hours:

4570

Captain / Total hours on type:

4064.00

Copilot / Total flying hours:

9476

Copilot / Total hours on type:

5100

Aircraft flight hours:

48489

Aircraft flight cycles:

32783

Circumstances:

The twin engine aircraft departed Tomsk Airport at 1010LT on a flight (callsign IK9007/SP5007) to Surgut, carrying 33 passengers and a crew of four. About an hour and 26 minutes into the flight, the left engine's 'chips in oil' warning light came on. About eight minutes later, a burning smell was noticed in the cockpit and the captain decided to divert to Nizhnevartovsk Airport. During the descent, the left engine caught fire. Its propeller was feathered and the crew decided to divert to Strezhevoy Airport. But as the fire could not be extinguished, the captain eventually attempted an emergency landing in the Ob River. Upon landing, the aircraft broke in two and came to rest in shallow water. Seven passengers were killed while all other occupants were rescued.

Probable cause:

The Interstate Aviation Committee (MAK) released their final report in Russian concluding the probable causes of the accident were:
The catastrophe of the AN-24 RA-47302 occurred when ditching became necessary due to a fire in the left hand engine's nacelle. The destruction of the aircraft and loss of life was caused by collision with underwater obstacles that the crew could not anticipate or avoid. The fire in the left hand engine nacelle was caused by the fracture of a centrifugal breather releasing an air-fuel emulsion into the engine compartment as well as a delayed reaction to shut the engine down by the crew following an magnetic chip detector indication together with indications of oil pressure fluctuations, a burning smell and a low oil pressure indication. A delay in indicating engine vibrations to the crew as result of degradation of the engine vibration sensoring equipment, most likely caused by changes of the rotor speed of the engine as result of the aft bearing failure of the compressor rotor and/or misalignment of the sensor, which probably influenced the decision of the crew to shut the engine down with a delay. Cause of the fracture of the centrifugal breather was the destruction of the impeller due to prolonged exposure to hot air-fuel emulsion due to the failure of the aft compressor rotor support bearing. It was not possible to determine the cause of the destruction of the aft compressor rotor support bearing due to significant secondary damage. Most likely the destruction was caused by misalignment such as:
- Incorrect assembly of support parts mating with the compressor rotor during on-condition engine repairs,
- Or deviations from required geometry of support parts mating with the compressor rotor.
Contributing factors were:
- Psychological unpreparedness of the captain to shut the engine down due to lack of experience with the aircraft on one engine inoperative
- Late detection of the fire and as a consequence late attempts to extinguish the fire, it was however not possible to establish why the fire was detected late due to lack of objective information about the performance of the fire alarm systems.

Final Report:

Crash of an Antonov AN-2 in Baturino: 1 killed

Date & Time: Dec 24, 1974 at 1050 LT

Type of aircraft:

Antonov AN-2

Operator:

Registration:

CCCP-15890

Flight Phase:

Flight Type:

Survivors:

Site:

Schedule:

Tomsk - Baturino

MSN:

1146 473 19

YOM:

1960

Flight number:

SU107

Location:

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Aircraft flight hours:

15055

Aircraft flight cycles:

15453

Circumstances:

The aircraft was completing a mail flight from Tomsk to Baturino, carrying 757 kg of mail, 120 kg of various goods, two pilot and a passenger in charge of the fret. Six minutes before the estimated time of arrival in Baturino, while cruising at an altitude of 200 meters, the engine failed. The crew elected to make an emergency landing when the airplane struck trees and crashed inverted in a wooded area located 13 km from Baturino. The captain was killed while both other occupants were injured.

Probable cause:

The exact cause of the engine failure could not be determined. However, it is believed it may be caused by an excessive accumulation of calamine on the intake valves.

Crash of a PZL-Mielec AN-2P in Kolpashevo

Date & Time: Oct 27, 1973

Type of aircraft:

PZL-Mielec AN-2

Operator:

Registration:

CCCP-70408

Flight Phase:

Takeoff (climb)

Flight Type:

Scheduled Revenue Flight

Survivors:

Yes

Site:

Airport (less than 10 km from airport)

Schedule:

Kolpashevo – Tomsk

MSN:

1G141-62

YOM:

1973

Location:

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Circumstances:

Shortly after takeoff, while in initial climb, the single engine aircraft stalled and crashed. There were no casualties but the aircraft was destroyed.

Probable cause:

The takeoff procedure was attempted while the aircraft has not been properly deiced.

Crash of an Antonov AN-2 in Tomsk: 3 killed

Date & Time: Sep 8, 1973 at 1702 LT

Type of aircraft:

Antonov AN-2

Operator:

Registration:

CCCP-41913

Flight Phase:

Landing (descent or approach)

Flight Type:

Training

Survivors:

Site:

Airport (less than 10 km from airport)

Schedule:

Tomsk - Tomsk

MSN:

1 21 473 07

YOM:

1952

Location:

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Aircraft flight hours:

15272

Aircraft flight cycles:

11785

Circumstances:

The crew was completing a local training mission at Tomsk-Bogashovo Airport. Following four circuits, the pilot-in-command initiated a left turn when, at a height of about 120 meters, the airplane banked left to an angle of 20° then stalled and crashed 230 metres from the southern runway threshold. The aircraft was totally destroyed by impact forces and a post crash fire and all three crew members were killed.

Probable cause:

The exact cause of the accident could not be determined with certainty. However, the assumption that the loss of control was caused by a possible jammed aileron control cable was not ruled out.