Originally Posted by
OldnGrounded
You've nailed it. Two FCCs can't meaningfully vote on two AoA vanes, no matter how everything is configured.
No, but if they discovered a discrepancy, they could turn the whole system off for the rest of the flight. Although this is not ideal, and a tri-voting system would be better, turning the system off WOULD have saved these two aircraft and all their passengers and crew.
In fact, all they needed was two vanes feeding information to one computer, to discover if there was a vane fault. But Boeing could not even be bothered to do that..!!
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