ASN logo
 
Status:Final
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) 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)


Photos

Add your photo of this accident or aircraft
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.
languages: languages

Share

The Aviation Safety Network is an exclusive service provided by:
Quick Links:

CONNECT WITH US: FSF Facebook FSF Twitter FSF Youtube FSF LinkedIn FSF Instagram

©2022 Flight Safety Foundation

701 N. Fairfax St., Ste. 250
Alexandria, Virginia 22314
www.FlightSafety.org