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Last updated: 28 April 2017
Fecha:sábado 14 mayo 1977
Hora:09:33 UTC
Tipo:Silhouette image of generic B703 model; specific model in this crash may look slightly different
Boeing 707-321C
Operado por:IAS Cargo
Registración: G-BEBP
Numéro de série: 18579/332
Año de Construcción: 1963
Horas Totales de la Célula:47621
Motores: 4 Pratt & Whitney JT3D-3B
Tripulación:Fatalidades: 5 / Ocupantes: 5
Pasajeros:Fatalidades: 1 / Ocupantes: 1
Total:Fatalidades: 6 / Ocupantes: 6
Daños en la Aeronave: Destruido
Consecuencias: Written off (damaged beyond repair)
Ubicación:3,7 km (2.3 milles) W of Lusaka Airport (LUN) (   Zambia)
Fase: Aproximación (APR)
Aeropuerto de Salida:Nairobi International Airport (NBO/HKNA), Kenia
Aeropuerto de Llegada:Lusaka Airport (LUN/FLLS), Zambia
The aircraft departed Nairobi (NBO) at 07:17 for the final leg of a London-Heathrow - Athens - Nairobi - Lusaka cargo flight. Boeing 707 G-BEBP proceeded to Lusaka at FL310. At 09:07 the flight was cleared to descend to FL110. This altitude was reached at 09:23, 37nm DME from Lusaka. A clearance was then given to descend further down to FL70 in 1000 feet steps. At 09:28 the co-pilot reported that the airfield was in sight. Lusaka then cleared the aircraft to descend to 6000 feet (2221 feet above runway elevation) and moments later a clearance was given to make a visual approach for runway 10. At 09:32 flaps were selected to 50 degrees. Suddenly, at 09:33, the complete right-hand horizontal stabilizer and elevator assembly were seen to separate in flight. The aircraft pitched rapidly nose down and dived vertically into the ground from a height of about 800 feet. The main wreckage was located 3660 m from the runway threshold.

Probable Cause:

CAUSE: "The accident was caused by a loss of pitch control following the in-flight separation of the right hand horizontal stabilizer and elevator as a result of a combination of metal fatigue and inadequate failsafe design in the rear spar structure. Shortcomings in design assessment, certification and inspection procedures were contributory factors.

Accident investigation:
investigating agency: Accidents Investigation Branch (AIB) - United Kingdom
status: Final
number: AAR 9/1978
released:8 February 1979
duration of investigation: 1 year and 9 months
download report: Report on the accident to Boeing 707 321C, G-BEBP near Lusaka International Airport, Zambia, 14 May 1977 (AIB AAR 9/1978)


Subsiguiente / acciones de seguridad

AAIB issued 4 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 Nairobi International Airport to Lusaka Airport as the crow flies is 1806 km (1129 miles).

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