Flight that killed former White House official pitched violently after takeoff

Plane did not encounter turbulence, but forces about four times stronger than gravity that caused it to swoop down before going up

The business jet flight that killed a former White House official earlier this month violently pitched up and down after pilots addressed cockpit warnings by switching off a system meant to keep the aircraft stable, but it did not encounter turbulence as was initially reported, federal investigators have said.

Dana Hyde's death on 3 March was the subject of a preliminary National Transportation Safety report Friday which described a series of mishaps before and after the Bombardier plane she was on swooped out of control.