Crash-aerien 24 FEB 1989 d'un Boeing 747-122 N4713U - Hawaii
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Statuts:Accident investigation report completed and information captured
Date:vendredi 24 fvrier 1989
Heure:02:00
Type/Sous-type:Silhouette image of generic B741 model; specific model in this crash may look slightly different
Boeing 747-122
Compagnie:United Airlines
Immatriculation: N4713U
Numéro de série: 19875/89
Année de Fabrication: 1970-10-20 (18 years 4 months)
Heures de vol:58814
Cycles:15027
Moteurs: 4 Pratt & Whitney JT9D-7A
Equipage:victimes: 0 / à bord: 18
Passagers:victimes: 9 / à bord: 337
Total:victimes: 9 / à bord: 355
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:près de Hawaii (   Océan Pacifique)
Phase de vol: En vol (ENR)
Nature:Transport de Passagers Intern.
Aéroport de départ:Honolulu International Airport, HI (HNL/PHNL), Etats-Unis d'Amérique
Aéroport de destination:Auckland International Airport (AKL/NZAA), Nouvelle-Zélande
Numéro de vol:UA811
Détails:
United Airlines Flight 811, a Boeing 747-122, N4713U, took off from Honolulu (HNL), Hawaii at 01:33 local time, bound for Sydney, Australia, with an intermediate stop at Auckland, New Zealand. The initial climb passed through an area of thunderstorms, so the captain elected to keep the seat belt sign on. As the aircraft was climbing, between 22,000 and 23,000 feet, explosive decompression was experienced. An emergency was declared at approximately 02:20 HST. The captain initiated a 180-degree left turn to avoid a thunderstorm and proceeded toward HNL. The forward lower lobe cargo door had opened in flight, taking with it a large portion of the forward right side of the cabin fuselage. The starboard side engines (no.3 and 4) were damaged and had to be shut down. Parts of the leading and trailing edge flaps where also damaged resulting in the crew electing to use only 10-degrees trailing edge flaps for landing (a non-normal configuration). This resulted in the aircraft having to land at a higher speed than it would under normal conditions. The aircraft was cleared to land at HNL runway 8L. At 02:34 HST, Honolulu tower was notified by the flight crew that the airplane was stopped and an emergency evacuation had commenced on the runway. During the decompression, nine passengers had been ejected from the airplane and lost at sea.

Probable Cause:

PROBABLE CAUSE: "The sudden opening of the forward lower lobe cargo door in flight and the subsequent explosive decompression. The door opening was attributed to a faulty switch or wiring in the door control system which permitted electrical actuation of the door latches toward the unlatched position after initial door closure and before takeoff. Contributing to the cause of the accident was a deficiency in the design of the cargo door locking mechanisms, which made them susceptible to deformation, allowing the door to become unlatched after being properly latched and locked. Also contributing to the accident was a lack of timely corrective actions by Boeing and the FAA following a 1987 cargo door opening incident on a Pan Am B-747."

Accident investigation:

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Investigating agency: NTSB
Status: Investigation completed
Duration: 3 years
Accident number: NTSB/AAR-92/02
Download report: Final report

Sources:
» NTSB/AAR-92/02


Opérations de secours

NTSB issued 17 Safety Recommendations

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Photos

photo of Boeing-747-122-N4713U
accident date: 24-02-1989
type: Boeing 747-122
registration: N4713U
photo of Boeing-747-122-N4713U
accident date: 24-02-1989
type: Boeing 747-122
registration: N4713U
photo of Boeing-747-122-N4713U
accident date: 24-02-1989
type: Boeing 747-122
registration: N4713U
photo of Boeing-747-122-N4713U
accident date: 24-02-1989
type: Boeing 747-122
registration: N4713U
photo of Boeing-747-122-N4713U
accident date: 24-02-1989
type: Boeing 747-122
registration: N4713U
photo of Boeing-747-122-N4713U
accident date: 24-02-1989
type: Boeing 747-122
registration: N4713U
 
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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