text:  And and therefore the secondary kind of unimportant system, which the engineers really didn't pay that much attention to, unfortunately, became a deadly system and pilots didn't understand what it was. I think it's also very important to note. And I remember Robert Sumwalt, who was the chairman of the National Transportation Safety Board, testified in Congress. And he was asked, well, could you could U.S. pilots handle the system even if they weren't fully trained on it?