Following the Lion Air crash in Indonesia last month, the FAA is focusing new scrutiny on the control architecture of the Boeing 737 MAX and may require the company to engineer a fix for an auto trim system installed on the airplane. The system wasn't well documented and reporting has revealed that pilots and airlines were unaware of it.
This is a companion discussion topic for the original entry at https://www.avweb.com/recent-updates/business-military/faa-probes-potential-737-max-design-flaw