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Last updated: 22 November 2019
Status:Definitief
Datum:woensdag 17 juni 1998
Tijd:20:46
Type:Silhouette image of generic B733 model; specific model in this crash may look slightly different
Boeing 737-322
Luchtvaartmaatschappij:United Airlines
Registratie: N364UA
Constructienummer: 24533/1756
Bouwjaar: 1989
Aantal vlieguren:27323
Motoren: 2 CFMI CFM56-3C1
Bemanning:slachtoffers: 0 / inzittenden: 5
Passagiers:slachtoffers: 0 / inzittenden: 65
Totaal:slachtoffers: 0 / inzittenden: 70
Schade: Groot
Gevolgen: Repaired
Plaats:Denver International Airport, CO (DEN) (   Verenigde Staten)
Fase: Taxi (TXI)
Soort vlucht:Binnenlandse lijnvlucht
Vliegveld van vertrek:Denver International Airport, CO (DEN/KDEN), Verenigde Staten
Vliegveld van aankomst:Ontario International Airport, CA (ONT/KONT), Verenigde Staten
Vluchtnummer:UA475
Beschrijving:
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

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 Denver International Airport, CO en Ontario International Airport, CA bedraagt 1307 km (817 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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