Estado:	Final
Fecha:	31 MAR 1971
Hora:	06:33 PST
Tipo:	Boeing 720-047B
Operador:	Western Air Lines
Registración:	N3166
Numéro de série:	19439/621
Año de Construcción:	1966
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; 1200m visibility in fog haze and smoke).

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."

Fuentes: