In a 737 MAX cockpit console, the black wheels on each side are connected to the horizontal tail and will spin if the stabilizer swivels. The instruments next to them have green indicators showing the angle of the stabilizer trim, with 0 being maximum nose-down. The two switches at bottom right, labeled “STAB TRIM,” are the cutoff switches that will end automated movement of the horizontal tail.
(Dimas Ardian / Bloomberg)