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10:41 AM EDT 07.05.12 CNN

A series of errors by pilots and a failure to react effectively to technical problems led to the crash of Air France Flight 447,
France's Bureau of Investigation and Analysis said Thursday in its final report on the disaster.The Brazil-to-France flight plunged
into the Atlantic Ocean on June 1, 2009, killing all 228 people on board.

The report details how the pilots failed to respond effectively to problems with the plane's speed sensors or to correct its trajectory
when things first started to go wrong. It makes new recommendations for the training of pilots and certification of planes, on top
of 25 safety recommendations made in an initial report last year.

Some safety recommendations have already been implemented but it could take years for others fully to come into effect, chief
investigator Alain Bouillard told reporters.Opinion: Why do planes still crash?The international aeronautic community will likely focus on
the crew's loss of awareness of what was going on, he said.The use of automatic systems on planes has improved safety overall,
Bouillard explained, but "when it comes down to it, safety will always be based on the capacity of the pilots and the signals which they
are given, which they have to understand and react to."It was an "exceptional" inquiry because of the scale of the disaster, the number
of countries involved and the difficulty of locating the plane's data recorders, he said.

The intense media coverage of the crash added to the pressure, said Bouillard.It's a crash that never should have happened, said
CNN's aviation specialist Richard Quest. The industry will be studying the human factors of the crew on the plane for many years to come.