NTSB Releases Findings on Fatal Private Jet Crash.

A Bombardier Challenger 300 twin-engine jet violently pitched upward then downward, killing a passenger, after pilots responding to automated cockpit warnings switched off a system that helps keep the aircraft stable. The National Transportation Safety Board didn’t reach any conclusions in its preliminary report on the main cause of the deadly March 3 accident, but it described a series of things that went wrong before and after the plane swooped out of control. The trim system of the Bombardier Challenger 300 twin-engine jet was the subject of a Federal Aviation Administration mandate last year that pilots conduct extra safety checks before flights.