Originally Posted by NigelOnDraft
The only way of deducing the failure is to apply an algorithm to the AoA values and determine if they are "sensible" versus other values - but how do you now know if it is the AoA or the other (IAS?) value in error?
Got it in one. The other issue there is introducing another layer of complexity into the control and flight management software, which like all other engineering disciplines adds greater potential points of failure as complexity increases.