Originally Posted by NoD
Please expand...
Where did you see "clear indications" ?
There was none.
The system decided to
silently discard the only reliable AOA data. When you realize the importance of the AOA data for the Airbus and its protection system to work properly, the logic would be for the system to at least advise the crew as soon as a significant difference between the AOA readings is identified.
Knowing that something was wrong with the AOA data, never the crew would have proceeded with an alpha protection system test ...
Please could you also expand on this e.g. with an example or illustration of the point?
The valid sensor was silently discarded and the other sensors were lying together with already the potential to wrongfully trigger a protection.
Two AOA vanes blocked at 4 deg which is pretty close to the angle at which the alpha protection is ready to take over in altitude. The BEA did not publish the indicated alpha prot value at FL410 during that flight, it would be of interest.
What happened to Eva Air and Lufthansa could have happened already in Perpignan.