There's circumstantial evidence this particular variety of MCAS upset doesn't look like runaway trim. The manifestation is transient, seems capricious, results

There's circumstantial evidence this particular variety of MCAS upset doesn't look like runaway trim. The manifestation is transient, seems capricious, results in surprise. U.S. based pilots have said they didn't know anything about MCAS or MCAS upset until the FAA issued an emergency airworthiness directive, AD#: 2018-23-51, expressed surprise and were critical to discover this after the fact. Years after the fact. And it took a crash. A second crash, despite the issuance of the AD suggests the AD is somehow sufficient. Maybe we don't know the full range of possible MCAS upset behavior. Maybe we don't know if there are additional factors that contribute to surprise and confusion.