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Accident
Last updated: 23 October 2017
Statuts:Enquête Officielle
Date:samedi 11 juin 1983
Heure:17:33
Type/Sous-type:Silhouette image of generic B722 model; specific model in this crash may look slightly different
Boeing 727-222A
Compagnie:United Airlines
Immatriculation: N7273U
Numéro de série: 21420/1377
Année de Fabrication: 1978
Heures de vol:14777
Equipage:victimes: 0 / à bord: 7
Passagers:victimes: 0 / à bord: 135
Total:victimes: 0 / à bord: 142
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Chicago-O'Hare International Airport, IL (ORD) (   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:Tampa International Airport, FL (TPA/KTPA), Etats-Unis d'Amérique
Détails:
A Boeing 727-222, N7273U, suffered a takeoff accident at Chicago-O'Hare Airport.
During the takeoff roll, the no. 1 engine failed and the takeoff was aborted at approx 70 kts. The aircrew taxied the aircraft clear of the runway and stopped on the reverse high speed turnoff. The aircrew of another company aircraft transmitted that the no. 1 engine was on fire. There was no fire warning light in the cockpit, but the no. 1 engine was shut down and a fire extinguisher was discharged into the engine. Another radio call was received that the engine was still on fire and a second extinguisher was discharged into the engine. The other 2 engines were also shut down and all occupants were evacuated using the emergency exits. Two passengers received serious injuries.
An investigation revealed the second stage turbine disk had fractured from fatigue which initiated at the base of cavities in the bottom of the air seal groove. The inside and outside surfaces of the disk air seal groove showed signs of fretting as if the mating air seal had been moving fore and aft within the groove.

Probable Cause:

Probable Cause:
turbine assembly,turbine wheel..chafed
turbine assembly,turbine wheel..fatigue

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 Chicago-O'Hare International Airport, IL et Tampa International Airport, FL est de 1620 km (1012 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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