Date: June 06, 1971
Time: 17:11
Location: Near Duarte, California
Operator: Hughes Airwest / Military - US Marine Air Corps
Flight #: 706
Route: Los Angeles - Salt Lake City
AC Type: McDonnell Douglas DC-9-31 / F4-B
Registration: N9345/151458
cn / ln: 47441/503 / ?
Aboard: 51   (passengers:44  crew:7)
Fatalities: 50   (passengers:44  crew:6)
Ground: 0
Summary: The DC-9 was climbing to FL 330 under the radar control of the LA ATC and the F4 was en route to El Toro under VFR. Visibility was good with no clouds. The F-4 was not detected by LA ATC because of an inoperative transponder and a low level temperature inversion in the area. In addition an inoperative oxygen system caused the F-4 to fly at a lower altitude. The collision took place at 15,150 feet. Both planes crashed into the San Gabriel Mountains. The pilot on the F4 was killed when the forward canopy did not jettison. The other crew member parachuted to safety unhurt. All forty-nine aboard the DC-9 were killed. Failure of both crews to see and avoid each other and failure of the F4 crew to request radar advisory service, particularly considering the fact that they had an inoperable transponder and flying at a lower altitude.

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