Or alternatively, if Boeing uses wood screws to attach an airplane door and the screw fails that's on Boeing, not the airline, pilot or screw manufacturer. But if it's sold as aerospace-grade attachment bolt with attachments for safety wire and a spec sheet that suggests the required loads are within design parameters then it's the bolt manufacturers fault when it fails, and they might have to answer for any deaths resulting from that. Unless Boeing knew or should have known that the bolts weren't actually as good as claimed, then the buck passes back to them
Of course that's wildly oversimplifying and multiple entities can be at fault at once. My point is that these are normal things considered in regular engineering and manufacturing
Of course that's wildly oversimplifying and multiple entities can be at fault at once. My point is that these are normal things considered in regular engineering and manufacturing