unfit to work, including one day the day he crashed the plane. what investigators didn't find a suicide note. >> we have not found anything in the surround inging personal or family or his professional surround ing surrounding that is giving us any hints that enable us to say anything about his motivation. >> reporter: a german aviation source tells cnn lubitz passed his recertification test in the summer. as part of that exam cnn learned he would have had to fill out this questionnaire, specifically asking are you taking any medication? do you have any psychological, psychiatric or neurological diseases? have you ever attempted suicide. lufthansa was not aware of any medical issues.