Pilot Jan Cocheret wrote about his fears about cockpit suicides last month . He said he was afraid to return from the toilet to find the door locked . Mr Cocheret highlighted how security measures could cause problems . Andreas Lubitz crashed the jet carrying 150 people into the Alps at 38,000 feet .
Pilot Jan Cocheret wrote about his fears about cockpit suicides last month . He said he was afraid to return from the toilet to find the door locked . Mr Cocheret highlighted how security measures could cause problems . Andreas Lubitz crashed the jet carrying 150 people into the Alps at 400mph .