The final report for Germanwings Flight 9525, which crashed into the Swiss Alps killing all 150 occupants on board on March 24th 2015, was released by the French Bureau of Enquiry and Analysis for civil aviation safety (BEA) on March 13th 2016. The report confirms the initial speculations that the first officer deliberately flew the aircraft into terrain.
An investigation into the co-pilots medical history was conducted and identified that approximately one month before the accident the co-pilot had been diagnosed with psychosomatic disorder and had been prescribed anti-depressant medications by a psychotherapist. A toxicology report identified that a number of these medications were present in the co-pilots remains and therefore he was deemed unfit to fly at the time of the accident. The reports states that no preventative action could have been taken by authorities, as no effort was made by the co-pilot or anyone else to notify the airline of his condition.
The BEA was able to identify critical moments within the cockpit by analysing data taken from the Cockpit Voice Recorder (CVR). Sound analysis was able to determine the point in which the captain left the cockpit and also his several unsuccessful attempts to re-enter, due to the cockpit door locking system. The CVR also recorded the controlled breathing of the co-pilot, indicating he was conscious and made a deliberate effort put the aircraft into a steep descent. As a result of the findings, current procedures for pilot mental evaluations were revised, including if a threat to passenger safety outweighed the requirements of the medical confidentiality of pilots. Six safety recommendations were made by the BEA, which included additional monitoring of pilots with histories of psychological illness.