Incident Overview

Date: Friday 25 May 1984
Aircraft Type: Tupolev Tu-134Sh2
Owner/operator: Soviet Air Force
Registration Number: 02
Location: near Donetsk – ÿ Ukraine
Phase of Flight: En route
Status: Destroyed, written off
Casualties: Fatalities: 7 / Occupants: 7
Component Affected: Back-up yaw damper circuitBack-up yaw damper circuit
Category: Accident
Narrative
A Tu-134 jet experienced a catastrophic failure during a flight from Zhdanov to Lugansk, resulting in its disintegration mid-air. Strong oscillations and lateral loads occurred shortly after takeoff, leading to a rapid descent to 2750 meters. A wiring fault involving cross-wired wires on the back-up yaw damper circuit caused the primary malfunction, while turbulence triggered a subsequent error in control commands.A Tu-134 jet experienced a catastrophic failure during a flight from Zhdanov to Lugansk, resulting in its disintegration mid-air. Strong oscillations and lateral loads occurred shortly after takeoff, leading to a rapid descent to 2750 meters. A wiring fault involving cross-wired wires on the back-up yaw damper circuit caused the primary malfunction, while turbulence triggered a subsequent error in control commands.

Description

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.

Source of Information

http://war.airdisaster.ru/database.php?id=64http://war.airdisaster.ru/database.php?id=64

Primary Cause

Wiring fault on the back-up yaw damper circuit.Wiring fault on the back-up yaw damper circuit.

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