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Accident
Last updated: 17 October 2017
Estado:Final
Fecha:lunes 9 mayo 1988
Hora:16:35
Tipo:Silhouette image of generic B741 model; specific model in this crash may look slightly different
Boeing 747-136
Operador:British Airways
Registración: G-AWND
Numéro de série: 19764/107
Año de Construcción: 1971-01-20 (17 years 4 months)
Horas Totales de la Célula:1868
Motores: 4 Pratt & Whitney JT9D-7A
Tripulación:Fatalidades: 0 / Ocupantes: 18
Pasajeros:Fatalidades: 0 / Ocupantes: 286
Total:Fatalidades: 0 / Ocupantes: 304
Daños en la Aeronave: Considerable
Consecuencias: Repaired
Ubicación:cerca Chicago-O'Hare International Airport, IL (ORD) (   Estados Unidos de América)
Fase: Aproximación (APR)
Naturaleza:Vuelo Internacional Programado
Aeropuerto de Salida:London-Heathrow Airport (LHR/EGLL), Reino Unido
Aeropuerto de Llegada:Chicago-O'Hare International Airport, IL (ORD/KORD), Estados Unidos de América
Descripción:
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."

Fuentes:
» NTSB


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NTSB issued 3 Safety Recommendations

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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 London-Heathrow Airport to Chicago-O'Hare International Airport, IL as the crow flies is 6297 km (3936 miles).

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