An indication but not proof. Bugs and unexpected situations can trip up software and hardware just as easily as people. A New Zealand Air checkout flight crashe

An indication but not proof. Bugs and unexpected situations can trip up software and hardware just as easily as people. A New Zealand Air checkout flight crashed because some sensor froze (as in ice) and fooled the computer into thinking the plane was level. The pilots failed as well as they assumed the computer could handle the issue.