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Last updated: 17 January 2022
Statuts:Enquête Officielle
Date:vendredi 14 novembre 2003
Heure:12:50
Type/Sous-type:Silhouette image of generic B744 model; specific model in this crash may look slightly different
Boeing 747-422
Compagnie:United Airlines
Immatriculation: N178UA
Numéro de série: 24385/820
Année de Fabrication: 1990-10-23 (13 years )
Heures de vol:57337
Moteurs: 4 Pratt & Whitney PW4056
Equipage:victimes: 0 / à bord: 21
Passagers:victimes: 0 / à bord: 335
Total:victimes: 0 / à bord: 356
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:San Francisco International Airport, CA (SFO) (   Etats-Unis d'Amérique)
Phase de vol: Au décollage (TOF)
Nature:Transport de Passagers Intern.
Aéroport de départ:San Francisco International Airport, CA (SFO/KSFO), Etats-Unis d'Amérique
Aéroport de destination:Hong Kong-Chek Lap Kok International Airport (HKG/VHHH), Hong-Kong
Numéro de vol:UA805
Détails:
United Airlines Flight 805, a Boeing 747-422, N178UA, experienced a tail strike on rotation at San Francisco, California, USA.
The first officer was the Pilot Flying (PF), and the airplane departed on runway 10L. The winds were 180 at 16, gusting to 22 knots. The takeoff roll was normal, and the PF utilized control wheel input to correct for the crosswind. A few seconds after rotation, the PF noted the stick shaker annunciate, and responded by gently easing back pressure off the control yoke. The captain and a relief pilot felt a nose wheel vibration following the takeoff.
The air traffic control tower contacted the flight crew alerting them of a possible tail strike after observing smoke from the airplane at rotation. The crew returned to land at San Francisco. Evaluation of the damage resulted in structural repair to two structural members.

Probable Cause:

A tail strike due to a combination of the wind shifting from a headwind to a tailwind during rotation, and the pilot's control inputs for the crosswind condition.

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 3 years and 5 months
Accident number: LAX04LA050
Download report: Final report


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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 San Francisco International Airport, CA et Hong Kong-Chek Lap Kok International Airport est de 11053 km (6908 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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