Originally Posted by PlaneS

The Emergency AD released for the MAX sheds some light on the system and what MAX pilots can expect if MCAS malfunctions. Some of the highlights include:

• If the autopilot is on or the flaps are extended, MCAS will not act on faulty AOA data.
• MCAS is limited to trim in 10 second increments, at 2.5 degrees max per increment, at a rate of 0.27 degrees per second. This is not a sudden nose-dive into the earth, but rather a gentle and slow buildup of nose-down trim.
• If stab trim is used to stop malfunctioning MCAS, it will restart 5 seconds after the trim switches are activated.
• The only 100% effective way to disengage the system is to move both STAB TRIM switches to CUTOUT and leave them there for the rest of the flight.
• IAS DISAGREE, ALT DISAGREE, AOA DISAGREE and FEEL DIFF PRESS are all potential alerts that may be associated with erroneous AOA data.