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Accident
Last updated: 19 October 2017
Status:Definitief
Datum:donderdag 27 december 1979
Tijd:18:39 UTC
Type:Silhouette image of generic B741 model; specific model in this crash may look slightly different
Boeing 747-121SF
Luchtvaartmaatschappij:Pan American World Airways (Pan Am)
Registratie: N771PA
Constructienummer: 19661/70
Bouwjaar: 1970-07-24 (9 years 5 months)
Aantal vlieguren:34615
Aantal vluchten:9505
Motoren: 4 Pratt & Whitney JT9D-7D
Bemanning:slachtoffers: 0 / inzittenden: 3
Passagiers:slachtoffers: 0 / inzittenden: 0
Totaal:slachtoffers: 0 / inzittenden: 3
Schade: Groot
Gevolgen: Repaired
Plaats:London-Heathrow Airport (LHR) (   Verenigd Koninkrijk)
Fase: Landing (LDG)
Soort vlucht:Vracht
Vliegveld van vertrek:New York-John F. Kennedy International Airport, NY (JFK/KJFK), Verenigde Staten
Vliegveld van aankomst:London-Heathrow Airport (LHR/EGLL), Verenigd Koninkrijk
Beschrijving:
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

Bronnen:
» NTSB


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Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen New York-John F. Kennedy International Airport, NY en London-Heathrow Airport bedraagt 5501 km (3438 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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