ASN Aircraft accident Antonov An-12B CCCP-12996 Surgut Airport (SGC)
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Status:Accident investigation report completed and information captured
Date:Sunday 31 January 1971
Type:Silhouette image of generic AN12 model; specific model in this crash may look slightly different
Antonov An-12B
Operator:Aeroflot, Tyumen Civil Aviation Directorate
Registration: CCCP-12996
MSN: 00347403
First flight: 1970
Engines: 4 Ivchenko AI-20M
Crew:Fatalities: 7 / Occupants: 7
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 7 / Occupants: 7
Aircraft damage: Damaged beyond repair
Location:14 km (8.8 mls) N of Surgut Airport (SGC) (   Russia)
Phase: Approach (APR)
Nature:Cargo
Departure airport:Tyumen-Roschino International Airport (TJM/USTR), Russia
Destination airport:Surgut Airport (SGC/USRR), Russia
Narrative:
Aileron oscillations coincided with flap extension. The crew misunderstood this as asymmetrical flap extension and retracted the flaps again. The airspeed had dropped to 172 knots. The aileron suddenly deflected then , causing a left roll. The aircraft undershot the runway.
The hinge moment reversal on the ailerons and subsequent loss of control was caused by icing.

Classification:
Icing
Loss of control

Sources:
» Soviet Transports
» NTSB/AAR-96/02 (144)


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Map
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 Tyumen-Roschino International Airport to Surgut Airport as the crow flies is 645 km (403 miles).
Accident location: Approximate; accuracy within a few kilometers.

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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