Accident description
Last updated: 1 September 2014
Status:Final
Date:Sunday 31 January 1971
Type:Silhouette image of generic AN12 model; specific model in this crash may look slightly different
Antonov 12B
Operator:Aeroflot, Tyumen Civil Aviation Directorate
Registration: CCCP-12996
C/n / 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
Airplane damage: Damaged beyond repair
Location:14 km (8.8 mls) from Surgut (   Russia)
Phase: Approach (APR)
Nature:Cargo
Departure airport:?
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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