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Accident
Last updated: 12 December 2017
Statuts:Enquête Officielle
Date:jeudi 27 décembre 1979
Heure:18:39 UTC
Type/Sous-type:Silhouette image of generic B741 model; specific model in this crash may look slightly different
Boeing 747-121SF
Compagnie:Pan American World Airways (Pan Am)
Immatriculation: N771PA
Numéro de série: 19661/70
Année de Fabrication: 1970-07-24 (9 years 5 months)
Heures de vol:34615
Cycles:9505
Moteurs: 4 Pratt & Whitney JT9D-7D
Equipage:victimes: 0 / à bord: 3
Passagers:victimes: 0 / à bord: 0
Total:victimes: 0 / à bord: 3
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:London-Heathrow Airport (LHR) (   Royaume Uni)
Phase de vol: A l'atterrissage (LDG)
Nature:Cargo
Aéroport de départ:New York-John F. Kennedy International Airport, NY (JFK/KJFK), Etats-Unis d'Amérique
Aéroport de destination:London-Heathrow Airport (LHR/EGLL), Royaume Uni
Détails:
The accident happened whilst the Boeing 747 cargo aircraft was being landed on runway 23 at London Heathrow Airport (LHR). At touchdown the number 4 pylon forward bulkhead, which supports the front of the engine, began to break free of the pylon because of weakening by fatigue and other pre-existing damage. The resulting downward movement of the engine during the landing roll ruptured the engine fuel feed pipe and several other connections with the engine including engine monitoring and fire warning circuitry. The high volume of fuel issuing from the ruptured fuel pipe caused a severe fire to develop under the number 4 pylon. The fire continued until the crew physically observed the fire as the aircraft was being turned off the runway at block 77(0), at which point the fire drill was carried out. This resulted in the closure of the fuel shut-off valve in the wing. The aircraft was brought to a halt and the airport fire service quickly brought the residual fire under control.

Probable Cause:

CAUSE: "The accident was caused by the failure of the forward bulkhead of the No 4 pylon when it was subjected to landing loads after it had been weakened by pre-existing fatigue. A major contributory factor was the absence of any routine check item which might otherwise have detected the onset of failure at an early stage."

Accident investigation:
cover
Investigating agency: AIB
Status: Investigation completed
Accident number: AAR 5/1981
Download report: Final report

Sources:
» NTSB


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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 New York-John F. Kennedy International Airport, NY et London-Heathrow Airport est de 5501 km (3438 miles).

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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