NBC4 chopper’s final moments: A blaring alarm, loss of altitude and panic. Why did it crash?
NBC4's helicopter was one of several news aircraft flying over the scene of a deadly bus crash in Chatsworth on Tuesday …
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NBC L.A. helicopter’s final broadcast could hold key clue to deadly crash
It was a night of devastation in Chatsworth that began with a deadly Metro bus collision and ended with the fiery crash …