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Last updated: 12 November 2019
Estado:Final
Fecha:miércoles 31 marzo 1971
Hora:06:33
Tipo:Silhouette image of generic B720 model; specific model in this crash may look slightly different
Boeing 720-047B
Operador:Western Air Lines
Registración: N3166
Numéro de série: 19439/621
Año de Construcción: 1967-08-27 (3 years 7 months)
Horas Totales de la Célula:11521
Ciclos:7011
Motores: 4 Pratt & Whitney JT3D-3B
Tripulación:Fatalidades: 5 / Ocupantes: 5
Pasajeros:Fatalidades: 0 / Ocupantes: 0
Total:Fatalidades: 5 / Ocupantes: 5
Daños en la Aeronave: Anulado
Consecuencias: Written off (damaged beyond repair)
Ubicación:Ontario International Airport, CA (ONT) (   Estados Unidos de América)
Fase: Aproximación (APR)
Naturaleza:Entrenamiento
Aeropuerto de Salida:Los Angeles International Airport, CA (LAX/KLAX), Estados Unidos de América
Aeropuerto de Llegada:Ontario International Airport, CA (ONT/KONT), Estados Unidos de América
Número de Vuelo: 366
Descripción:
Control was lost during a 3-engine missed ILS approach procedure and the aircraft crashed.
Failure of the aircraft rudder hydraulic actuator support fitting led to the loss of left rudder control. The loss of control situation was worsened by the degraded external visual clues (600 feet overcast; 1200 m visibility in fog haze and smoke).

Probable Cause:

PROBABLE CAUSE: "The failure of the aircraft rudder hydraulic actuator support fitting. The failure of the fitting resulted in the inapparent loss of left rudder control which, under the conditions of the flight, precluded the pilots’ ability to maintain directional control during a simulated engine-out missed-approach. The existing weather conditions degraded external visual cues, thereby hampering rapid assessment of aircraft performance by the flight check captain."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 2 months
Accident number: NTSB/AAR-72-18
Download report: Final report


Subsiguiente / acciones de seguridad

NTSB issued 9 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 Los Angeles International Airport, CA to Ontario International Airport, CA as the crow flies is 75 km (47 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 720

  • 154 built
  • 6th loss
  • 5th accidente fatal
  • 3rd worst accident (a la hora)
  • 4th worst accident (actualmente)
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