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Accident
Last updated: 22 October 2017
Status:Definitief
Datum:maandag 9 mei 1988
Tijd:16:35
Type:Silhouette image of generic B741 model; specific model in this crash may look slightly different
Boeing 747-136
Luchtvaartmaatschappij:British Airways
Registratie: G-AWND
Constructienummer: 19764/107
Bouwjaar: 1971-01-20 (17 years 4 months)
Aantal vlieguren:1868
Motoren: 4 Pratt & Whitney JT9D-7A
Bemanning:slachtoffers: 0 / inzittenden: 18
Passagiers:slachtoffers: 0 / inzittenden: 286
Totaal:slachtoffers: 0 / inzittenden: 304
Schade: Groot
Gevolgen: Repaired
Plaats:nabij Chicago-O'Hare International Airport, IL (ORD) (   Verenigde Staten)
Fase: Nadering (APR)
Soort vlucht:Internationale lijnvlucht
Vliegveld van vertrek:London-Heathrow Airport (LHR/EGLL), Verenigd Koninkrijk
Vliegveld van aankomst:Chicago-O'Hare International Airport, IL (ORD/KORD), Verenigde Staten
Beschrijving:
The aircraft was on final approach to Chicago O'Hare Airport when a structural failure of the number three flap track occurred. The aircraft sustained substantial damage to the left wing, left inboard flap assembly, left inboard spoilers and spoiler support beam. The pilot experienced significant uncommanded roll and yaw, but regained control of the aircraft and executed an uneventful landing.
The investigation has revealed a history of flap track cracking problems associated with stress corrosion and design inadequacy. A design change of the member was accomplished in 1971 by the manufacturer, but flap tracks of the earlier design were allowed to remain in service on 239 aircraft. The airworthiness directives and service bulletins applicable to this particular structural member are not adequate in methodology and periodicity to ensure crack detection, and do not require inspection for the cause of the crack-corrosion pits.

Probable Cause:

PROBABLE CAUSE: "Failure of the number three flap track due to stress corrosion cracking. factors contributing to this failure are insufficient design of the member and inadequate inspection and maintenance procedures to detect cracks before they propagate to a critical length."

Bronnen:
» NTSB


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Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen London-Heathrow Airport en Chicago-O'Hare International Airport, IL bedraagt 6297 km (3936 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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