According to the FAA Emergency AD, an erroneous Angle of Attack (AOA) input, among other symptoms, can result in indications of:
•
IAS DISAGREE alert.
•
ALT DISAGREE alert.
I'm wondering why an erroneous Angle of Attack (AOA) input would cause those alerts. Is it because the pitot-static position error corrections require an AoA input?
Secondly, I wonder what really occured on previous flights. Was it really an UAS situation or were above alerts incorrectly diagnosed as a pitot-static system problem?