The cockpit voice recorder suggested he crashed the plane deliberately.
A transcript leaked to German media revealed the frenzied final minutes, with the pilot, locked out of the cockpit, shouting "open the damn door!"
The German newspaper Bild published a transcript of the final minutes of the flight as caught on the cockpit voice recorder. It has not been independently verified.
Meanwhile, there have been calls for a full investigation to be completed before any further conclusions are revealed.
The German Airline Pilots Association pointed out that the flight data recorder was still missing and that the reasons that led to the crash could only be determined once all data had been examined.The European Cockpit Association said the release of voice recorder data was a "serious breach" of globally accepted rules. It said many questions remained unanswered.
And if there is a uninterruptable autopilot system on board (allowing for remote piloting of the plane or setting of the autopilot system in the event of a hijacking) then the FDR would show if it was activated just prior to the autopilot system crashing the plane.
Well, previously I had reported that the FDR had been reported as being damaged beyond repair but that may not be the case.
It seems, someone stole the memory chip out of it.