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Accident | |
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Date | 24 January 1988 |
Summary | Unexplained engine problems, collision with the ground |
Site | near Nizhnevartovsk Airport (Ugra, RSFSR, USSR) 60°58′30″N76°31′34″E / 60.97500°N 76.52611°E |
Aircraft | |
Aircraft type | Yakovlev Yak-40 |
Operator | Bugulma United Air Detachment, Privolzhsk Civil Aviation Directorate |
Registration | CCCP-87549 |
Flight origin | Nizhnevartovsk Airport, Nizhnevartovsk |
Stopover | Roshchino Airport, Tyumen |
Destination | Bugulma Airport, Bugulma |
Passengers | 27 |
Crew | 4 |
Fatalities | 27 |
Survivors | 4 |
Aeroflot Flight 29674 was a Yakovlev Yak-40 aircraft operated by Aeroflot that crashed near Nizhnevartovsk on Sunday, 24 January 1988 during takeoff, resulting in the deaths of 27 people.[ citation needed ]
The Yak-40, tail number CCCP-87549 (factory number 9531442, serial number 42-14, manufactured by the Saratov Aviation Plant in 1975), was operating flight 29674 from Nizhnevartovsk to Bugulma, with a first stop in Tyumen (Roshchino Airport). The aircraft was piloted by a crew consisting of Captain Nail Muradymov, First Officer S. Uvarov, and Flight Engineer N. Nagumanov. Stewardess Zemfira Mubarakshina was serving in the cabin. There were 27 passengers on board.[ citation needed ]
At 16:50 MSK and 18:50 local time, the aircraft began its takeoff from Nizhnevartovsk Airport. However, during the acceleration on the runway, at a speed of 150 km/h, the flight engineer noticed, according to the cockpit voice recorder, that the "air starter open" light illuminated. Immediately after liftoff, the high-pressure compressor (HPC) RPM of engines No. 2 and 3 (center and right, respectively) dropped, and within a second, engine No. 1 (left) also experienced an RPM drop. Engines No. 1 and 3 then shut down, while engine No. 2's RPM initially fell to 74%, but then returned to takeoff power. By this time, the Yak-40 had climbed to an altitude of 35 meters. Losing thrust from two of its three engines, the aircraft began to lose speed and roll. Ninety-one seconds after liftoff, it crashed into the slope of a ravine 1 800 meters from the runway's end and 18 meters to the right of its axis, hitting a power line and completely disintegrating.[ citation needed ]
The air temperature at the time was −31°C. Rescue operations were conducted poorly, and the crash site was only located five hours later. By that time, only four passengers were still alive. The remaining four crew members and 23 passengers had perished.[ citation needed ]
The commission was unable to determine the exact cause of why the engines' RPMs dropped below the level required for horizontal flight in the takeoff configuration. There were only two main hypotheses:
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