Accident Tupolev Tu-134Sh2 02, Friday 25 May 1984
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Date:Friday 25 May 1984
Time:18:34
Type:Silhouette image of generic T134 model; specific model in this crash may look slightly different    
Tupolev Tu-134Sh2
Owner/operator:Soviet Air Force
Registration: 02
MSN: 2350202
Year of manufacture:1972
Total airframe hrs:3173 hours
Cycles:2370 flights
Fatalities:Fatalities: 7 / Occupants: 7
Other fatalities:0
Aircraft damage: Destroyed, written off
Category:Accident
Location:near Donetsk -   Ukraine
Phase: En route
Nature:Military
Departure airport:Zhdanov Airport (MPW/UKCM)
Destination airport:Voroshilovgrad Airport (VSG/UKCW)
Narrative:
The Tu-134 jet was attached to the Voroshilovgrad Higher Military Aviation School of Navigators and operated on a flight from Zhdanov (now Mariupol) to Voroshilovgrad (now Lugansk). The school's commander was on board as a passenger.
Twelve minutes after takeoff, at height of 4200 m, strong oscillations in pitch and a roll occurred. The plane suffered big vertical and lateral loadings and descended to 2750 m. After 38 seconds it disintegrated in mid-air.
During repairs at a military maintenance facility, two wires on the electrical circuit of the back-up yaw damper had been cross-wired. The main yaw-damper performed uneventful. On the accident flight however the plane passed through a zone of strong turbulence. The back-up yaw damper then kicked in, sending wrong commands to the elevator and the ailerons.

Sources:

airdisaster.ru

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