Incident Overview

Date: Tuesday 13 January 2004
Aircraft Type: Yakovlev Yak-40
Owner/operator: Uzbekistan Airways
Registration Number: UK-87985
Location: Tashkent Airport (TAS) – ÿ Uzbekistan
Phase of Flight: Landing
Status: Destroyed, written off
Casualties: Fatalities: 37 / Occupants: 37
Component Affected: Aircraft Engine and Control SystemsAircraft Engine and Control Systems
Category: Accident
An Uzbekistan Airways flight HY1154 experienced a significant loss of control due to a rapid descent following a glideslope loss. The aircraft descended below the glideslope, resulting in a significant height loss and subsequent impact with a concrete building. The pilot initiated reverse thrust and subsequently lost control, leading to a crash.An Uzbekistan Airways flight HY1154 experienced a significant loss of control due to a rapid descent following a glideslope loss. The aircraft descended below the glideslope, resulting in a significant height loss and subsequent impact with a concrete building. The pilot initiated reverse thrust and subsequently lost control, leading to a crash.

Description

Uzbekistan Airways’ flight HY1154, the evening flight from Termez to Tashkent, departed Termez with a crew of five and an almost full load (32) of passengers. Weather was poor as the flight approached the airport. After reporting capturing the glideslope the air traffic controller reported a vertical visibility of 60 m and a runway visual range of 1300 m. About 12,5 km out, the aircraft’s rate of descent increased, causing it to descend below the glideslope. The rate of descent was arrested at a height of 170 m, 8 km from the threshold of runway 08L and they continued in level flight. At the Outer Marker (3,5 km from the runway) they should have started their initial approach, but the crew continued level flight thus flying above the glideslope now. With 2,5 km to go the airplane descended slightly at 1-1,5 m/sec. At the Inner Marker the descent rate increased to 2-2,6 m/sec. The crew then probably saw the runway lights below them. The engines were brought back to idle and reverse thrust was applied at a height of 60 m. When it appeared that they would not be able to land given the remaining runway length, reverse thrust was deselected and engine power was increased. At that point the airplane touched down 260 m past the end of the runway. It continued until the right wing struck a concrete building. The plane then lost the left wing before it crashed through a concrete wall. The airplane broke up, crashed into a ditch and caught fire.

Primary Cause

Rapid descent and loss of control due to a glideslope loss.Rapid descent and loss of control due to a glideslope loss.

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