The tailplane - it rotates in the forward plane, so forward and back; the tailplane flap is on the trailing edge and also goes up and down independently.
We used to have tailplane flap problems which were often diagnosed as tailplane flap actuator faults, this meant changing it and then testing it. It shouldn't have been a problem but we did have occasions with an over zealous rigger who pushed the column backwards and forwards whilst testing the tailplaneflaps. As we were perched on top of it at the time, you need to have a free hand ready to grap something so you didn't fall off.
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