Accident
Last updated: 22 August 2014
Estado:Final
Fecha:domingo 6 junio 1971
Hora:18:11
Tipo:Silhouette image of generic DC93 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-31
Operador:Hughes Airwest
Registración: N9345
Numéro de série: 47441/503
Año de Construcción: 1969
Horas Totales de la Célula:5542
Motores: 2 Pratt & Whitney JT8D-7
Tripulación:Fatalidades: 5 / Ocupantes: 5
Pasajeros:Fatalidades: 44 / Ocupantes: 44
Total:Fatalidades: 49 / Ocupantes: 49
Víctimas de la colisión:Fatalidades: 1
Daños en la Aeronave: Anulado
Consecuencias: Written off (damaged beyond repair)
Ubicación:7 km (4.4 milles) N of Duarte, CA (   Estados Unidos de América) show on map
Fase: En ruta (ENR)
Naturaleza:Vuelo Doméstico Programado
Aeropuerto de Salida:Los Angeles International Airport, CA (LAX/KLAX), Estados Unidos de América
Aeropuerto de Llegada:Salt Lake City International Airport, UT (SLC/KSLC), Estados Unidos de América
Número de Vuelo: 706
Descripción:
Airwest flight 706, a DC-9, was to fly from Los Angeles, CA (LAX) to Seattle, WA (SEA) with intermediate stops at Salt Lake City (SLC), Boise (BOI), Lewiston (LWS), Pasco (PSC) and Yakima (YKM). The aircraft departed Los Angeles at 18:02. At 18:09 the crew reported leaving FL120 and Los Angeles ARTCC cleared them direct to Daggett. At 17:16 h a US Marine Corps McDonnell F-4B Phantom 151458 departed Naval Auxiliary Air Station (NAAS) Fallon for a flight to MCAS El Toro at low altitude. The aircraft had several technical difficulties, including an inoperative transponder and a leak in the oxygen system. Due to deteriorating visibility northwest of Palmdale, the crew climbed to 15,500 feet . Shortly after level-off, aircraft was 50 miles from MCAS El Toro. The pilot executed a 360° aileron roll at this time, which took approximately 3seconds to complete. The Radar Intercept Officer (RIO) estimated that the true airspeed in the climb and after level-off was 420 knots. The F-4B collided with the Airwest DC-9 about 1 minute and 20sec after the roll, at 15150 feet. After the collision, the F-4 began to tumble violently about the lateral axis. The RIO waited about 5 seconds, and, after seeing numerous warning lights in the cockpit, he ejected from the aircraft . The ejection was successful, and he parachuted to the ground without injury. The other F-4 crewmember did not survive the accident.

PROBABLE CAUSE: The failure of both crews to see and avoid each other but it is recognized that they had only marginal capability to detect, assess, and avoid the collision. Other causal factors include a very high closure rate, comingling of IFR and VFR traffic in an area where the limitation of the ATC system precludes effective separation of such traffic, and failure of the crew of BuNo458 to request radar advisory service, particularly considering the fact that they had an inoperable transponder."

Fuentes:

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - USA
report status: Final
report number: NTSB/AAR-72-26
report released:30-AUG-1972
duration of investigation:451 days (1 year 2.9 months)
download report: Hughes Airwest DC-9, N9345, and U.S. Marine Corps F-4B, 151458, near Duarte, California, June 6, 1971. (NTSB/AAR-72-26)
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NTSB issued 10 Safety Recommendations

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Fotos

photo of
Closing diagram of Airwest DC-9 and F-4 Phantom near Duarte, CA
photo of
View from Airwest DC-9 flight deck prior to collision with F-4 Phantom
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View from F-4 Phantom flight deck prior to collision with Airwest DC-9
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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 Salt Lake City International Airport, UT as the crow flies is 943 km (589 miles).

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