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Last updated: 24 October 2017
Statuts:Enquête Officielle
Date:dimanche 10 janvier 2010
Type/Sous-type:Silhouette image of generic A319 model; specific model in this crash may look slightly different
Airbus A319-131
Compagnie:United Airlines
Immatriculation: N816UA
Numéro de série: 871
Année de Fabrication: 1998-07-31 (11 years 6 months)
Heures de vol:39679
Moteurs: 2 IAE V2522-A5
Equipage:victimes: 0 / à bord: 5
Passagers:victimes: 0 / à bord: 48
Total:victimes: 0 / à bord: 53
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Newark-Liberty International Airport, NJ (EWR) (   Etats-Unis d'Amérique)
Phase de vol: A l'atterrissage (LDG)
Nature:Transport de Passagers Nat.
Aéroport de départ:Chicago-O'Hare International Airport, IL (ORD/KORD), Etats-Unis d'Amérique
Aéroport de destination:Newark-Liberty International Airport, NJ (EWR/KEWR), Etats-Unis d'Amérique
Numéro de vol:UA634
An Airbus A319-131, registered N816UA, was damaged when it landed at Newark-Liberty International Airport, NJ (EWR) with its right hand main landing gear retracted. The occupants were evacuated using the emergency slides.
United Airlines flight UA634 departed Chicago-O'Hare International Airport, IL (ORD) left the gate at 05:51 on a domestic passenger flight to Newark-Liberty International Airport, NJ (EWR). The flight was expected to land at Newark about 09:00 local time. While on finals, about 08:54 the crew apparently experienced problems getting the undercarriage down and locked. The crew carried out a missed approach and climbed to an altitude of 2000 feet. The flight circled the area West of the airport before a new approach was carried out to runway 04L. The airplane landed with the right main gear retracted and came to rest on the runway with the no. 2 engine touching the runway surface.

Probable Cause:

PROBABLE CAUSE: "A mechanical failure of internal components of the right main landing gear door actuator resulting in the flight crew being unable to fully extend the right main landing gear using the normal and alternate procedures.
Contributing to this incident was a circular reference in the company Flight Manual in which the Landing Gear Gravity Extension checklist referred back to the Landing Gear Unsafe Indication After Extension checklist rather than the Landing Gear - Partial Gear or Gear Up Landing checklist."

Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 6 months
Accident number: DCA10IA021
Download report: Summary report

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Opérations de secours

EASA issued 2 Airworthiness Directives

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photo of Airbus A319-131 N816UA
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United Flight 634 after emergency landing at Newark on Twitpic Share photos on twitter with Twitpic

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 Chicago-O'Hare International Airport, IL et Newark-Liberty International Airport, NJ est de 1146 km (717 miles).
Accident location: Approximate; accuracy within a few kilometers.

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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