Andreas Lubitz tore up a sick note on the morning of the doomed flight . German prosecutors have found evidence questioning his mental health . Relatives could sue Germanwings over their failure to spot Lubitz 's illness . Lubitz commanded the jet 's autopilot to fly into the Alps at 3,000 feet .
Andreas Lubitz tore up a sick note on the morning of the doomed flight . German prosecutors have found evidence questioning his mental health . Relatives could sue Germanwings over their failure to spot Lubitz 's illness . Lubitz commanded the jet 's autopilot to fly into the Alps at 400mph .