Originally Posted by
mross
But the alpha vane was replaced, so it probably wasn't the fault unless both new and old were defective. Maybe the real fault was 'downstream' of the alpha vane?
Probably. But a less likely possibility is that replacement solved one problem but was not done correctly and created a larger one.
Why were the previous 3 flights recoverable but not this one ?
And with all the planes out there flying hundreds if not thousands of flights daily fitted with the same systems, why was this plane so far the only one exhibiting the anomaly ?