Crash of an Antonov AN-12 in Nizhnevartovsk

Date & Time: Nov 1, 1996
Type of aircraft:
Registration:
RA-11851
Flight Type:
Survivors:
Yes
MSN:
4 020 03
YOM:
1964
Country:
Region:
Crew on board:
6
Crew fatalities:
Pax on board:
9
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
On final approach, the aircraft lost height and struck the ground short of runway threshold. The undercarriage were torn off and the aircraft bounced before coming to rest few dozen metres further. All 15 occupants escaped uninjured while the aircraft was damaged beyond repair. At the time of the accident, the total weight of the aircraft was nine tons above the maximum landing weight.

Crash of an Antonov AN-24RV in Bugulma: 41 killed

Date & Time: Nov 26, 1991 at 0502 LT
Type of aircraft:
Operator:
Registration:
CCCP-47823
Survivors:
No
Schedule:
Nizhnevartovsk - Bugulma
MSN:
17307204
YOM:
1971
Country:
Region:
Crew on board:
4
Crew fatalities:
Pax on board:
37
Pax fatalities:
Other fatalities:
Total fatalities:
41
Circumstances:
The aircraft departed Nizhnevartovsk on a charter flight to Bugulma, carrying four crew members and 37 employees from an oil company. Weather conditions in Bugulma were poor with clouds down to 80 metres, icing conditions and a visibility of 800 metres. At an altitude of 1,100 metres on approach, the crew encountered icing conditions but did not consider it necessary to activate the deicing systems. Still descending to the altitude of 900 metres, the icing alarm sounded in the cockpit but the captain decided to continue the approach in such configuration. After the crew selected the flaps down to an angle of 30°, he was cleared to land when the aircraft became unstable and departed the approach path to the right. After the aircraft crossed the permissible deviation limit, the crew was instructed by ATC to initiate a go-around procedure. The captain increased engine power and initiated a go-around maneuver when the aircraft adopted a high angle of attack then stalled and pitched down to an angle of 75-80°. At a speed of 260 km/h, the aircraft struck the ground 802 metres short of runway and was destroyed upon impact. The wreckage was found 598 metres to the right of the extended runway centerline and all 41 occupants were killed.
Probable cause:
The accident was the consequence of the combination of the following factors:
- Icing conditions and poor weather conditions that were underestimated and misevaluated by the flight crew,
- An excessive accumulation of frost on the stabilizers (up to 15 millimetres),
- Failure of the crew to activate the deicing systems prior to enter the clouds,
- The decision of the captain to continue the approach after the icing alarm sounded,
- The crew selected flaps down to an angle of 30° without inspecting the wings and stabs surfaces, (in icing conditions, flaps should be deployed in 15° max),
- The flaps were not retracted when the crew initiated the go-around procedure, which caused the aircraft to adopt a high angle of attack,
- Poor crew interactions,
- Lack of crew supervision and mutual monitoring and checks.

Crash of a Yakovlev Yak-40 in Nizhnevartovsk: 27 killed

Date & Time: Jan 24, 1988 at 1850 LT
Type of aircraft:
Operator:
Registration:
CCCP-87549
Flight Phase:
Survivors:
Yes
Schedule:
Nizhnevartovsk - Tyumen - Bugulma
MSN:
9 53 14 42
YOM:
1975
Flight number:
SU29674
Country:
Region:
Crew on board:
4
Crew fatalities:
Pax on board:
27
Pax fatalities:
Other fatalities:
Total fatalities:
27
Aircraft flight hours:
13978
Aircraft flight cycles:
14766
Circumstances:
Liftoff was completed at a speed of 220 km/h after a course of 1,700 meters. Immediately after takeoff, at a height of 2 meters, engines n°2 and 3 lost approximately 20% of power. Few seconds later, the engine n°1 also suffered a power reduction of about 10%. The aircraft then rolled to the right to an angle of 60°, lost height and crashed in a field located 1,800 meters past the runway end, bursting into flames. Four passengers were seriously injured while 27 other occupants were killed.
Probable cause:
The exact cause of the loss of power on all three engines could not be determined with certainty, also due to the absence of evidences, efficient recording systems and testimony from the crew who were killed.

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

Date & Time: Oct 18, 1978
Type of aircraft:
Operator:
Registration:
CCCP-02457
Flight Phase:
Survivors:
Yes
Schedule:
Nizhnevartovsk – Strezhevoy
MSN:
1G117-68
YOM:
1970
Country:
Region:
Crew on board:
0
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
Shortly after takeoff from Nizhnevartovsk Airport, the crew encountered control and stability problems. The pilot-in-command attempted an emergency landing when the aircraft crashed in flames in a swampy area near the airfield. All occupants were evacuated safely while the aircraft was destroyed by a post crash fire.
Probable cause:
It was determined that the aircraft was not properly cleared of snow and ice prior to takeoff.

Crash of an Antonov AN-24B in Nizhnevartovsk: 24 killed

Date & Time: Oct 13, 1969 at 1727 LT
Type of aircraft:
Operator:
Registration:
CCCP-47772
Survivors:
Yes
Schedule:
Tyumen – Surgut – Nizhnevartovsk
MSN:
79901405
YOM:
1967
Flight number:
SU227
Country:
Region:
Crew on board:
4
Crew fatalities:
Pax on board:
52
Pax fatalities:
Other fatalities:
Total fatalities:
24
Aircraft flight hours:
2756
Aircraft flight cycles:
2298
Circumstances:
The crew started the approach to Nizhnevartovsk Airport by night and marginal weather conditions. Due to erroneous calculations, the aircraft was not properly aligned on the approach path and the captain decided to make a go-around. Six minutes later, he initiated a second approach. On short final, ATC asked the pilot if he has the runway in sight. As the answer was positive, the crew was cleared to land. Less than a minute later, the airplane struck tree tops, stalled and crashed in flames in a wooded area located 1,092 meters short of runway threshold. 32 occupants were injured while 24 others were killed, among them the copilot and a flight attendant.
Probable cause:
It was determined that the propellers went inadvertently into reverse when the crew activated the engine de-icing system. It was later discovered during investigations that there was a conception error on this type of aircraft between the de-icing systems and the thrust reversal systems that could activate simultaneously. Nevertheless, when control was lost, the flaps were deployed in an angle of 17° instead of 38° as prescribed, which was considered as a contributing factor.