Originally Posted by
AGBagb
Anyone know whether the Max is more-or-less the same? I.e., you can have tripped the cut-out switches, but their cut-out effect can be overridden?
The Stabilizer Trim Override Switch and the Stab Trim PRI Cutout and Stab Trim B/U Cutout Switches accomplish two different things. The Override Switch relates to the control column actuated stabilizer trim cutout switches; these aren't manually selected, they are activated by movement of the control column such that when that movement opposes the automatic trim direction it stops the operation of the trim. It's called breakaway. When the STAB TRIM override switch is positioned to OVERRIDE, the control column actuated stabilizer trim cutout switches are disabled and electric trim can be used regardless of control column position. Just by the bye, we now know that breakaway won't interrupt MCAS (which makes sense when you know about the purpose of MCAS but which would be initially confusing if you weren't aware of MCAS).
The Stab Trim PRI Cutout and Stab Trim B/U Cutout Switches are provided to allow the autopilot and main electric trim inputs to be disconnected from the stabilizer trim motor. They essentially revert the stabiliser trim to only manual inputs via the trim wheels.