The POH refers to the elevator trim-tabs as anti-tabs that are also used as trim-tabs. I'm guessing it's similar to a lot of piper aircraft like the cherokee. You can find a few descriptions and videos of how they work. The trim sets the base position of the tab in the same direction as a normal trim tab and then the tab moves with the elevator in the same direction as the elevator movement to work as an antiservo tab. The way it's currently animated wouldn't work, so just animating the elevator trim as a normal trim tab would be better. Animating the antiservo movement too is probably a bit more work. Wish I could find a video of the TBM elevator moving to confirm some of this.
TBM 850
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