If the engineers are smart, they'll CYA and let the manager take the fall. If the designs are obviously bad, the engineers should be smart enough to immediately predict the failure modes, then create a paper trail (email, messages, forms and signatures, whatever) to show that manager's decision to do X will cause Y, while alternative solution A was not chosen due to B. The manager needs to own up to her designs, otherwise it is worthless. —
Nelson 15 hours ago