Originally Posted by
Longtimer
It is inconceivable this system was not challenged during test with loss of/compromised AoA, to elicit this very behaviour.
Inconceivable, but clearly they did not know. Because if they knew, and the system was approved, somebody got some splainin’ to do.
FAA:
This AD was prompted by analysis performed by the manufacturer showing that if an erroneously high single angle of attack (AOA) sensor input is received by the flight control system, there is a potential for repeated nose-down trim commands of the horizontal stabilizer. We are issuing this AD to address this potential resulting nose-down trim, which could cause the flight crew to have difficulty controlling the airplane, and lead to excessive nose-down attitude, significant altitude loss, and possible impact with terrain....
Erm, other than that, what’s for supper...?