Status:	Definitief
Datum:	24 FEB 1999
Tijd:	16:34
Type:	Tupolev 154M
Luchtvaartmaatschappij:	China Southwest Airlines
Registratie:	B-2622
Constructienummer:	90A-846
Bouwjaar:	1990
Aantal vlieguren:	14135
Aantal vluchten:	7748
Motoren:	3 Soloviev D-30KU-154-II
Bemanning:	slachtoffers: 11 / inzittenden: 11
Passagiers:	slachtoffers: 50 / inzittenden: 50
Totaal:	slachtoffers: 61 / inzittenden: 61
Schade:	Afgeschreven
Gevolgen:	Written off (damaged beyond repair)
Plaats:	Ruian (China)
Fase:	Nadering (APR)
Soort vlucht:	Binnenlandse lijnvlucht
Vliegveld van vertrek:	Chengdu Airport (CTU/ZUUU), China
Vliegveld van aankomst:	Wenzhou Airport (WNZ/ZSWZ), China
Vluchtnummer:	4509

Beschrijving:
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.

Bronnen:
» ICAO Adrep
» Soviet Transports
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