Originally Posted by
Plato90s
Not being a pilot, I would say that you have outlined actions which makes sense... once the pilot knows that there is a hidden software (MCAS) which is activating and controlling the aircraft.
As a 737 pilot, I disagree.
None of the corrective actions, other than extending flaps, require knowledge of MCAS. Extending flaps, though it would work, is not part of the applicable procedures and is not how a crew should respond to an unschedule MCAS activation.
Unscheduled MCAS presents as a runaway stabilizer and the existing runaway stabilizer procedure is how it should be handled. The longer you delay applying the appropriate procedure(s), the farther the stabilizer runaway (regardless of cause) progresses and the more difficult it will be to recover. A stabilizer runaway event is not the time to delay while considering the possible causes. The first items on the checklist are called "Immediate Action Items" for a reason. They need to be accomplished promptly to prevent the situation from deteriorating further.