Accident
Last updated: 25 October 2014
Statuts:Enquête Officielle
Date:dimanche 6 juin 1971
Heure:18:11
Type/Sous-type:Silhouette image of generic DC93 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-31
Compagnie:Hughes Airwest
Immatriculation: N9345
Numéro de série: 47441/503
Année de Fabrication: 1969
Heures de vol:5542
Moteurs: 2 Pratt & Whitney JT8D-7
Equipage:victimes: 5 / à bord: 5
Passagers:victimes: 44 / à bord: 44
Total:victimes: 49 / à bord: 49
Victime de la collision:victimes: 1
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:7 km (4.4 milles) N of Duarte, CA (   Etats-Unis d'Amérique) show on map
Phase de vol: En vol (ENR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Los Angeles International Airport, CA (LAX/KLAX), Etats-Unis d'Amérique
Aéroport de destination:Salt Lake City International Airport, UT (SLC/KSLC), Etats-Unis d'Amérique
Numéro de vol: 706
Détails:
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."

Sources:

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - United States of America
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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Opérations de secours

NTSB issued 10 Safety Recommendations

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Photos

photo of McDonnell Douglas DC-9-31 N9345
Wreckage of the Hughes Airwest DC-9
photo of McDonnell Douglas DC-9-31 N9345
Wreckage of the F-4 Phantom
photo of
Closing diagram of Airwest DC-9 and F-4 Phantom near Duarte, CA
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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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Plan
Ce plan montre l'aéroport de départ ainsi que la supposé destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Los Angeles International Airport, CA et Salt Lake City International Airport, UT est de 943 km (589 miles).

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