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Last updated: 4 December 2021
Estado:Final
Fecha:jueves 31 enero 1957
Tipo:Silhouette image of generic DC7 model; specific model in this crash may look slightly different
Douglas DC-7B
Operador:Douglas Aircraft Company
Registración: N8210H
Numéro de série: 45192/764
Año de Construcción: 1957-01-31 ()
Horas Totales de la Célula:1
Motores: 4 Wright R-3350 (972TC18DA4)
Tripulación:Fatalidades: 4 / Ocupantes: 4
Pasajeros:Fatalidades: 0 / Ocupantes: 0
Total:Fatalidades: 4 / Ocupantes: 4
Víctimas en Tierra:Fatalidades: 3
Víctimas de la colisión:Fatalidades: 1
Daños en la Aeronave: Destruido
Consecuencias: Written off (damaged beyond repair)
Ubicación:6,5 km (4.1 milles) NW of Sunland, Los Angeles, CA (   Estados Unidos de América)
Fase: En ruta (ENR)
Naturaleza:Prueba
Aeropuerto de Salida:Santa Monica Airport, CA (SMO/KSMO), Estados Unidos de América
Aeropuerto de Llegada:Santa Monica Airport, CA (SMO/KSMO), Estados Unidos de América
Descripción:
Douglas DC-7B N8210 took off from Santa Monica at 10:15 for a local functional test flight. At 10:50 a US Air Force Northrop F-89D-40-NO Scorpion (52-1870) took off from Palmdale, also on a functional test flight following overhaul. Purpose of the flight was to check the radar fire control systems of both all-weather interceptors. Both aircraft were performing their tests at an altitude of 25000 feet, over a published local flying zone (bounded by San Diego, Santa Barbara, Bakersfield and El Centro). An almost head-on mid-air collision occurred and part of the DC-7's left wing was sheared off. The F-89 crashed in flames in the mountains; one of the two crew ejected safely. The DC-7 crashed onto a schoolyard.
At the time of the collision the DC-7 was flying at FL250 and at about 330 knots true airspeed to check carburetor operation at maximum cruise power. The F-89 was turning left from a 135deg heading to 45deg heading using a 30deg bank for a simulated intercept.

Probable Cause:

PROBABLE CAUSE: "The high rate of near head-on closure at high altitude, which together with physiological limitations, resulted in a minimum avoidance opportunity during which the pilots didn't see each other's aircraft."

Fuentes:
» ICAO Aircraft Accident No.9 (Circular 56-AN/51), p. 38-44
» Pacoima Jr. High School Airplane Crash of 1957 (audio recording as it happened)


Fotos

photo of Douglas-DC-7B-N8210H
accident date: 31-01-1957
type: Douglas DC-7B
registration: N8210H
 

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