Copilot was being treated for mentall illness that he hid from his employers.
QUOTE
The U.S. Federal Aviation Administration had issued Lubitz a third-class medical certificate, the Associated Press reported. In order to obtain such a certificate, a pilot must be cleared of psychological problems including psychosis, bipolar disorder and personality disorder “that is severe enough to have repeatedly manifested itself by overt acts.â€
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Diogenes of Sinope:
"It is not that I am mad, it is only that my head is different from yours."
"Other dogs bite only their enemies, whereas I bite also my friends in order to save them."
Arnold Judas Rimmer, BSC, SSC:
"Better dead than smeg."
