Originally Posted by
MurphyWasRight
FCeng Thank you for your explanations, they are appreciated.
Is it possible for sts trim inputs to reset the MCAS logic, is it known with certainty that only pilot switches will do this?
(Assuming my understanding of sts is anywhere close to correct)
STS activation will not reset MCAS. In fact it may well be that MCAS has higher priority than STS such that when MCAS has inserted airplane nose down stabilizer motion STS is precluded from acting until MCAS has been reset either by pilot trim or low AOA and subsequent MCAS removal of its airplane nose down stabilizer increment by way of having run the stabilizer for an equal increment in the airplane nose up direction. I'll see if I can dig up the answer to that one.
(See detailed MCAS description that I added to the Ethiopian accident thread today.)