I'm curious as well regarding the thought of an engineering design flaw, if that is the case, then there are a LOT of those frames out there, with that particular hinge joint design, which would make this an industry wide concern. From the picture that I have seen, whether it be Terns, or others, it appears the welds broke, leaving the adjoining pieces intact?

Have there been any design changes since the defect was been determined?

Lastly, I am surprised we are not seeing any pictures, by owners, showing hairline cracks, something to indicate a complete failure might be forthcoming?