Flugunfall 31 JAN 1971 einer Antonov An-12B CCCP-12996 - Surgut Airport (SGC)
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Status:Accident investigation report completed and information captured
Datum:Sonntag 31 Januar 1971
Flugzeugtyp:Silhouette image of generic AN12 model; specific model in this crash may look slightly different
Antonow An-12B
Fluggesellschaft:Aeroflot, Tyumen Civil Aviation Directorate
Kennzeichen: CCCP-12996
Werknummer: 00347403
Baujahr: 1970
Triebwerk: 4 Ivchenko AI-20M
Besatzung:Todesopfer: 7 / Insassen: 7
Fluggäste:Todesopfer: 0 / Insassen: 0
Gesamt:Todesopfer: 7 / Insassen: 7
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:14 km (8.8 Meilen) N of Surgut Airport (SGC) (   Russland)
Flugphase: Annäherung (APR)
Betriebsart:Frachtflug
Flug von:Tyumen-Roschino International Airport (TJM/USTR), Russland
Flug nach:Surgut Airport (SGC/USRR), Russland
Unfallbericht:
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.

Informationsquelle:
» 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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