Honestly the mechanical engineering is also error prone, its just got margins that make it hard to mess up. There are instances where it does mess up, like th

Honestly the mechanical engineering is also error prone, its just got margins that make it hard to mess up. There are instances where it does mess up, like the long list of cargo door issues through the 80s, the 737 rudder issue (as well as lots of other less famous hydraulic servo issues), and other issues.