Accident Antonov An-12B CCCP-12996,
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ASN Wikibase Occurrence # 330878
 

Date:Sunday 31 January 1971
Time:
Type:Silhouette image of generic AN12 model; specific model in this crash may look slightly different    
Antonov An-12B
Owner/operator:Aeroflot, Tyumen Civil Aviation Directorate
Registration: CCCP-12996
MSN: 00347403
Year of manufacture:1970
Engine model:Ivchenko AI-20M
Fatalities:Fatalities: 7 / Occupants: 7
Aircraft damage: Destroyed, written off
Category:Accident
Location:14 km N of Surgut Airport (SGC) -   Russia
Phase: Approach
Nature:Cargo
Departure airport:Tyumen-Roschino International Airport (TJM/USTR)
Destination airport:Surgut Airport (SGC/USRR)
Confidence Rating: Accident investigation report completed and information captured
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.

Sources:

Soviet Transports
NTSB/AAR-96/02 (144)

Location

Revision history:

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