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Accident
Last updated: 15 December 2017
Estado:Final
Fecha:jueves 21 marzo 1968
Hora:03:53
Tipo:Silhouette image of generic B721 model; specific model in this crash may look slightly different
Boeing 727-22C
Operador:United Airlines
Registración: N7425U
Numéro de série: 19200/416
Año de Construcción: 1967-05-25 (10 months)
Horas Totales de la Célula:2208
Motores: 3 Pratt & Whitney JT8D-1
Tripulación:Fatalidades: 0 / Ocupantes: 3
Pasajeros:Fatalidades: 0 / Ocupantes: 0
Total:Fatalidades: 0 / Ocupantes: 3
Daños en la Aeronave: Anulado
Consecuencias: Written off (damaged beyond repair)
Ubicación:Chicago-O'Hare International Airport, IL (ORD) (   Estados Unidos de América)
Fase: Despegue (TOF)
Naturaleza:Carga
Aeropuerto de Salida:Chicago-O'Hare International Airport, IL (ORD/KORD), Estados Unidos de América
Aeropuerto de Llegada:San Francisco International Airport, CA (SFO/KSFO), Estados Unidos de América
Número de Vuelo:UA9963
Descripción:
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


Subsiguiente / acciones de seguridad
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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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Chicago-O'Hare International Airport, IL to San Francisco International Airport, CA as the crow flies is 2943 km (1840 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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Boeing 727

  • 1832 built
  • 8th loss
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