Originally Posted by
FCeng84
With AOA reading erroneously high, each time that the crew trimmed nose up the criteria for MCAS to put in another nose down increment were satisfied. For several minutes the pattern of MCAS puts in nose down followed by pilot putting in nose up repeated many times. Why during the last minute the crew responded to MCAS stabilizer increments with quick blips of trim but not nearly enough to re-trim the stabilizer is a mystery. All of that on top of why the crew allowed the system to take the airplane away from trim so many times without recognizing they should disable automatic stabilizer control ....
Indeed a mystery. The CVR will hopefully shed some light on it, and provide valuable information on how diagnosing a problem like this can be made easier.
But really, the knowledge that leaving electric trim alone would also have inhibited additional MCAS inputs might have been valuable. I infer that using the mechanical trim wheel will not reset MCAS?
Bernd