Loss of control Accident Yakovlev Yak-40 CCCP-87638, Thursday 16 December 1976
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Date:Thursday 16 December 1976
Time:13:08
Type:Silhouette image of generic YK40 model; specific model in this crash may look slightly different    
Yakovlev Yak-40
Owner/operator:Aeroflot / Ukraine
Registration: CCCP-87638
MSN: 9141919
Year of manufacture:1971
Total airframe hrs:5762 hours
Cycles:6627 flights
Engine model:Ivchenko AI-25
Fatalities:Fatalities: 5 / Occupants: 5
Other fatalities:0
Aircraft damage: Destroyed, written off
Category:Accident
Location:near Kazakovskoye -   Ukraine
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Training
Departure airport:Zaporozhye Airport (OZH/UKDE)
Destination airport:Zaporozhye Airport (OZH/UKDE)
Narrative:
The Yakovlev operated on a training flight during which the pilots were practicing countering a (simulated) uncommanded stabilizer trim change. During these manoeuvres the airplane stalled. It entered a spin and crashed 1.4 km west of Novogupalovka railway station near Kazakovskoye.

Conclusion: The cause of the disaster is the loss of airspeed, followed by stall and transfer to a tailspin. Possible causes of speed loss are:
a) a mistake in the piloting technique by the crew;
b) piloting the aircraft according to, possibly, overestimated readings of the left pilot's airspeed indicator.

Sources:

Soviet Transports

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