Details like this end to make my eyebrow rise . If I were a whole lot more cynical I might think that the Boeing execs wanted to try an experiment to see if the company could survive a series of designed in crashes. You don’t tell your test pilots about a crucial characteristic? You omit redundancy? Is somebody at Boeing making big money on a bet how soon one would crash? Some kind of insurance scam? It keeps getting crazier over there.
OH dear and here’s their latest design offering, coming in 2020...read the fine print:
https://static.interestingengineering.com/images/APRIL/sizes/boeing_777_x_resize_md.jpg
