Accident
Last updated: 29 July 2014
Status:Schlussbericht
Datum:Mittwoch 20 November 1974
Zeit:07:54
Flugzeugtyp:Boeing 747-130
Fluggesellschaft:Lufthansa
Kennzeichen: D-ABYB
Werknummer: 19747/29
Baujahr: 1970-03-30 (4 years 8 months)
Betriebsstunden:16781
Triebwerk: 4 Pratt & Whitney JT9D-7
Besatzung:Todesopfer: 4 / Insassen: 17
Fluggäste:Todesopfer: 55 / Insassen: 140
Gesamt:Todesopfer: 59 / Insassen: 157
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:Nairobi International Airport (NBO) (   Kenia) show on map
Flugphase: Start (TOF)
Betriebsart:Internationaler Linienflug
Flug von:Nairobi International Airport (NBO/HKNA), Kenia
Flug nach:Johannesburg International Airport (JNB/FAJS), Südafrika
Flugnummer: 540
Unfallbericht:
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 1120m past the end of runway 24 and struck an elevated road 114m further on. The aircraft broke up and caught fire before coming to rest 454m past the initial point of impact.

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."

Informationsquelle:
» Flight International 28.08.1976 (481)
» ICAO Circular 132-AN/93 (181-194)


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Map
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 Johannesburg International Airport as the crow flies is 2898 km (1812 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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