The previous Lion Air crew used them after the pilot riding in the jumpseat went back and grabbed his copy of what I'd assume was the flight manual and had an ah-hah moment. There are, in fact, two switches to turn off the electronic control of the horizontal stabilizer. You don't want to do that because the plane may be left in a state where you can't control it manually and you only have a few thousand feet of altitude to recover. You could almost certainly disable just about anything by pulling the appropriate circuit breaker. This is an inherent problem with putting big engines under the wing (and is a problem in the 737 Classic, NG, and MAX). ![]() ![]() With everything disabled there is a risk that applying full throttle will result in the airplane pitching up dramatically beyond the ability of the elevator to pitch the airplane back down and potentially inducing a stall. With autopilot and autothrottle engaged there would be similar logic at play because the general goal would be to not have the automation induce a stall. MCAS is designed to work only with autopilot disengaged.
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