Comment Re:WSJ source? (Score 2) 28
It's based on (2) happening, not (1).
I read speculation on this after the report came out, and supposedly the potential issue is that it's easy to put the fuel cut-off switches in a position that isn't locked. As a result, engine vibration or something like that can cause the switches to slide back into the cut-off position.
Not a pilot, commenting on speculation, so take that for what little it's worth. The thing to me is that even if it's the case Boeing's original switch had that flaw, the fact the switches were replaced twice since the flaw was discovered suggests it's improbable now.