a stability augmentation system (sas) is another type of automatic flight control system; however, instead of maintaining the aircraft on a predetermined attitude or flight path, the sas will actuate the aircraft flight controls to dampen out aircraft buffeting regardless of the attitude or flight path. sas can automatically stabilize the aircraft in one or more axes. the most common type of sas is the yaw damper which is used to eliminate the dutch roll tendency of swept-wing aircraft. some yaw dampers are integral to the autopilot system while others are stand-alone systems.