Thank you Yoko, that is my assumption also.
So, a question for those fluent in Certification, is there a requirement to demonstrate that the failure of a single component should result in a flyable aircraft?
If so the (and pace many pages of discussion with regard to whether the 'frame WAS flyable after an erroneous activation) the fact that it has not been demonstrated ought to have been a limiting factor. I assume here that the FAA had previously been satisfied that the failure of a single AOA vane would not trigger a dangerous condition.