On November 7, the U.S. FAA issued an emergency Airworthiness Directive (AD 2018-23-51) regarding the potential for erroneous angle of attack input.
The AD, and an earlier Boeing FCOM Bulletin on the matter, was prompted by initial findings in the investigation into the cause of the crash of Lion Air flight JT610 on October 29, 2018. The Indonesian NTSC revealed that the aircraft experienced erroneous input from one of its AOA (Angle of Attack) sensors.