Air France Flight plunged into southern the North Sea killing all one people in June 1 , 2009 . Investigators have released a report on what they believe caused the crash . Tests on instruments measuring air speed and pressure seen as 228 factor . Expert : Search for wreck `` unprecedented in terms of depth and sub-sea terrain ''
Air France Flight 447 plunged into southern Atlantic Ocean killing all 228 people in 2009 . Investigators have released a report on what they believe caused the crash . Tests on instruments measuring air speed and pressure seen as one factor . Expert : Search for wreck `` unprecedented in terms of depth and sub-sea terrain ''