Originally Posted by
HazelNuts39
If you are referring to the 'zipper' trace on page 111, I don't see any effect of that on the airplane's behavior.
Remember that could also just as easily be an "invalid value" rendered as the lowest possible value in range by the graphing software. I'm not arguing it's definitely one thing or the other, but given the aircraft's actual trajectory I'm inclined to think it's that. Given that it occurs prior to AP disconnect, I'm also inclined to think they'd have noticed and pointed out flickering values on the FMS display if they'd seen it as there wasn't much else going on in the flight deck at that time.