ASN Aircraft accident Yakovlev Yak-40 CCCP-88208 Ust-Kut Airport
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Date:Friday 17 December 1976
Type:Silhouette image of generic YK40 model; specific model in this crash may look slightly different
Yakovlev Yak-40
Operator:Aeroflot, East Siberia Civil Aviation Directorate
Registration: CCCP-88208
MSN: 9631349
First flight: 1976
Total airframe hrs:327
Engines: 3 Ivchenko AI-25
Crew:Fatalities: 3 / Occupants: 3
Passengers:Fatalities: 4 / Occupants: 4
Total:Fatalities: 7 / Occupants: 7
Aircraft damage: Destroyed
Aircraft fate: Written off (damaged beyond repair)
Location:1,5 km (0.9 mls) NW of Ust-Kut Airport (   Russia)
Phase: Initial climb (ICL)
Departure airport:Ust-Kut Airport (UKX/UITT), Russia
Destination airport:Kirensk Airport (KCK/UIKK), Russia
A Yakovlev 40 cargo plane was destroyed in an accident at Ust-Kut, Russia. The four passengers and three crew members were killed.
The airplane carried 1200 kg of cargo. Two women accompanied the cargo to Kirensk. Two Aeroflot technicians were also on board.
The crew taxied out in a hurry.
In preparing for takeoff the left barometric pressure altimeter had erroneously been set to a value 10 mm Hg higher than the actual. The before takeoff checklist was not fully accomplished. The crew did not realise that the stabilizer was set at -6° instead of the calculated position of -3,6°.
During takeoff from runway 30 the airplane rotated rapidly and became airborne prior to attaining takeoff speed.
At an altitude of 100-120 m at a speed of 210-220 km/h, 20 km/h below the speed mentioned in the Flight Manual, the crew retracted the flaps, while simultaneously lowering the pitch angle for acceleration speed.
Takeoff was performed on a moonless night, with a lack of visual cues in the direction of takeoff.
The crew did not notice that the airplane was dangerously close to the ground, also because the altimeter had been set to the incorrect pressure. The altimeter showed an altitude 100 m higher than the actual altitude.
The airplane struck trees, crashed into the forest, and burst into flames.

Wrong takeoff configuration (flaps/trim)
Controlled Flight Into Terrain (CFIT) - Ground

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This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Ust-Kut Airport to Kirensk Airport as the crow flies is 172 km (108 miles).
Accident location: Exact; deduced from official accident report.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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