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Last updated: 8 December 2021
Statuts:Enquête Officielle
Date:mercredi 20 novembre 1974
Heure:07:54
Type/Sous-type:Silhouette image of generic B741 model; specific model in this crash may look slightly different
Boeing 747-130
Compagnie:Lufthansa
Immatriculation: D-ABYB
Numéro de série: 19747/29
Année de Fabrication: 1970-03-30 (4 years 8 months)
Heures de vol:16781
Moteurs: 4 Pratt & Whitney JT9D-7
Equipage:victimes: 4 / à bord: 17
Passagers:victimes: 55 / à bord: 140
Total:victimes: 59 / à bord: 157
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Nairobi International Airport (NBO) (   Kénya)
Phase de vol: Au décollage (TOF)
Nature:Transport de Passagers Intern.
Aéroport de départ:Nairobi International Airport (NBO/HKNA), Kénya
Aéroport de destination:Johannesburg International Airport (JNB/FAJS), Afrique du Sud
Numéro de vol:LH540
Détails:
Boeing 747 D-ABYB was taking off for the last leg of the Frankfurt (FRA) - Nairobi (NBO) - Johannesburg (JNB) flight when the crew felt vibration or buffeting following lift off. The captain, suspecting wheel imbalance, raised the gear. A lack of acceleration forced the crew to lower the nose in order to maintain airspeed. The Boeing continued to descend however and contacted the ground 1120 m past the end of runway 24 and struck an elevated road 114 m further on. The aircraft broke up and caught fire before coming to rest 454 m past the initial point of impact.

Probable Cause:

PROBABLE CAUSE: "The accident was caused by the crew initiating a take-off with the leading edge flaps retracted because the pneumatic system which operates them had not been switched on. This resulted in the aircraft becoming airborne in a partially stalled condition which the pilots did not identify in the short time available to them for recovery. Major contributory factors were the lack of warning of a critical condition of leading edge flap position and the failure of the crew to complete satisfactorily their checklist items."

Sources:
» Flight International 28 August 1976 (481)
» ICAO Circular 132-AN/93 (181-194)


Photos

photo of Boeing-747-130-D-ABYB
accident date: 20-11-1974
type: Boeing 747-130
registration: D-ABYB
photo of Boeing-747-130-D-ABYB
accident date: 20-11-1974
type: Boeing 747-130
registration: D-ABYB
 

Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Nairobi International Airport et Johannesburg International Airport est de 2898 km (1812 miles).
Accident location: Exact; deduced from official accident report.

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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