Accident description
Last updated: 30 September 2014
Status:Final
Date:Wednesday 24 February 1999
Time:16:34
Type:Tupolev 154M
Operator:China Southwest Airlines
Registration: B-2622
C/n / msn: 90A-846
First flight: 1990
Total airframe hrs:14135
Cycles:7748
Engines: 3 Soloviev D-30KU-154-II
Crew:Fatalities: 11 / Occupants: 11
Passengers:Fatalities: 50 / Occupants: 50
Total:Fatalities: 61 / Occupants: 61
Airplane damage: Damaged beyond repair
Location:Ruian (   China) show on map
Phase: Approach (APR)
Nature:Domestic Scheduled Passenger
Departure airport:Chengdu Airport (CTU/ZUUU), China
Destination airport:Wenzhou Airport (WNZ/ZSWZ), China
Flightnumber:4509
Narrative:
The aircraft was on a flight from Chengdu to Wenzhou and was approaching Wenzhou when, at 1000m, the flaps were extended. At that moment, the aircraft suddenly pitched down and dove into the ground out of control. The Tupolev crashed into a farm field and exploded, causing a 200x100 feet hole in the ground. Several farmers were injured by the flying debris.

PROBABLE CAUSE: A self-locking nut, other than castle nut with cotter pin as specified, had been installed at the bolt for connection between pull rod and bellcranck in the elevator control system. The nut screwed off, resulting in bolt loss, which led to the loss of pitch control.

Classification:
Wrong installation of parts

Loss of control

Sources:
» ICAO Adrep
» Soviet Transports


Photos

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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Chengdu Airport to Wenzhou Airport as the crow flies is 1704 km (1065 miles).

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Tupolev 154

  • 52nd loss
  • 1026 built
  • 15th worst accident (at the time)
  • 22nd worst accident (currently)
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 China
  • 7th worst accident (at the time)
  • 8th worst accident (currently)
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