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Accident
Last updated: 21 October 2017
Statuts:Enquête Officielle
Date:jeudi 21 mars 1968
Heure:03:53
Type/Sous-type:Silhouette image of generic B721 model; specific model in this crash may look slightly different
Boeing 727-22C
Compagnie:United Airlines
Immatriculation: N7425U
Numéro de série: 19200/416
Année de Fabrication: 1967-05-25 (10 months)
Heures de vol:2208
Moteurs: 3 Pratt & Whitney JT8D-1
Equipage:victimes: 0 / à bord: 3
Passagers:victimes: 0 / à bord: 0
Total:victimes: 0 / à bord: 3
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Chicago-O'Hare International Airport, IL (ORD) (   Etats-Unis d'Amérique)
Phase de vol: Au décollage (TOF)
Nature:Cargo
Aéroport de départ:Chicago-O'Hare International Airport, IL (ORD/KORD), Etats-Unis d'Amérique
Aéroport de destination:San Francisco International Airport, CA (SFO/KSFO), Etats-Unis d'Amérique
Numéro de vol:UA9963
Détails:
The takeoff warning horn sounded shortly after commencing takeoff from runway 09R. The takeoff was continued as the crew tried to figure out what caused the warning. The horn ceased prior to reaching rotate speed. The stickshaker came on and thrust was added, but the aircraft failed to climb and the captain elected to discontinue the takeoff. The 727 settled back to the macadam shoulder off the right side of the runway and struck a ditch, coming to rest 1100 feet beyond the runway end and 300 feet right of the extended centreline. The flaps had been set at 2deg instead of takeoff range of 5-25 degrees.

Probable Cause:

PROBABLE CAUSE: "The failure of the crew to abort the takeoff after being warned of an unsafe takeoff condition."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 285 days (10 months)
Accident number: NTSB/AAR-69-01
Download report: Final report


Opérations de secours
Following a recommendation by the NTSB, the FAA reviewed the procedures prescribed in U.S. air carrier's manuals to ensure that takeoffs will be aborted whenever the takeoff warning horn sounds prior to reaching V1, unless there are other overriding factors.

NTSB issued 2 Safety Recommendations

Show all AD's and Safety Recommendations

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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 San Francisco International Airport, CA est de 2943 km (1840 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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Boeing 727

  • 1832 built
  • 8ème loss
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