Yamaha,
It is worth pointing out that maintenance error has overtaken CFIT/pilot error as a major factor in recent accidents and incidents. However, this should be qualified with the fact that aviation safety has (overall) improved but maintenance has not improved at the same rate.
Mandatory Human Factors training for maintenance engineers focusses on those error-provoking conditions to which the LAE is most prone. If nothing is done to remove these conditions, the LAE is left to cope with them to the best of her/his ability and the potential for error remains high.