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Last updated: 6 December 2019
Statuts:Enquête Officielle
Date:mercredi 17 juin 1998
Heure:20:46
Type/Sous-type:Silhouette image of generic B733 model; specific model in this crash may look slightly different
Boeing 737-322
Compagnie:United Airlines
Immatriculation: N364UA
Numéro de série: 24533/1756
Année de Fabrication: 1989
Heures de vol:27323
Moteurs: 2 CFMI CFM56-3C1
Equipage:victimes: 0 / à bord: 5
Passagers:victimes: 0 / à bord: 65
Total:victimes: 0 / à bord: 70
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Denver International Airport, CO (DEN) (   Etats-Unis d'Amérique)
Phase de vol: Au roulage (TXI)
Nature:Transport de Passagers Nat.
Aéroport de départ:Denver International Airport, CO (DEN/KDEN), Etats-Unis d'Amérique
Aéroport de destination:Ontario International Airport, CA (ONT/KONT), Etats-Unis d'Amérique
Numéro de vol:UA475
Détails:
The Boeing 737-322, N364UA, was substantially damaged in a collision accident with a parked truck during push back at Denver International Airport, Colorado. The two occupants of the truck received minor injuries.
United Airlines flight UA475, a scheduled domestic passenger service from Denver, Colorado, to Ontario, California, had been cleared by ramp control for pushback from B53. The airplane had moved backwards about 20 feet when the captain felt "a thud." The tug operator advised him that they had struck a catering truck. The APU DET INOP light illuminated and the APU (auxiliary power unit) was secured. The passengers and crew deplaned via mobile airstairs. Postaccident inspection revealed the airplane's tailcone had struck the Dobbs International Services truck, knocking the truck over on its right side.

The collision tore a 15 inch hole between stringers 16L (left) and 26R (right). Stringers 26L, 26R, and 27R were also damaged. Four inches aft of BS 1016, between stringers 22R and 23R, there was a 3 inch x 3 inch hole in the fuselage. The skin and stringers 26L and 26R, from BS 1033 to BS 1066, were damaged. BS 1156 frame was crushed and there was a large hole in the APU access door. There was an 11 inch x 5 inch hole in the aft pressure bulkhead. Three chords and BS 1016 frame were damaged in this area The fiberglass tailcone was crushed.

Probable Cause:

PROBABLE CAUSE: "Inadequate visual lookout by ground personnel (tug operator). Factors include failure of the airline to provide proper assistance (wing walkers) to the tug operator, and inadequate pushback procedures by the airline; inattention of the catering truck driver, and failure of the flight crew to illuminate the rotating beacon prior to or during pushback."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 11 months
Accident number: FTW98FA273
Download report: Summary 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 Denver International Airport, CO et Ontario International Airport, CA est de 1307 km (817 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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