You can find this stuff in your AFMS or approved flight manual supplement. To be perfectly ramp-check legal, you must have a current supplement aboard. A three-axis autopilot includes a rudder servo. Most are yaw-damping systems that keep the tail where it belongs. Clutches A slip clutch allows the human to overpower the autopilot.
Clutches represent a compromise between performance and safety.
Clutches are strength limiters and therefore degrade the ability of the autopilot to efficiently fly the airplane. But in order to protect the occupants in the event of an autopilot malfunction, manufacturers install slip clutches to give you some control. It won't be a picnic to fight a clutch, but you ought to be able to arrest the undesired control movement while disconnecting the system. The slip clutches are sized during certification to balance the malfunction controllability with performance. For this reason, the tolerance of the clutch is important.