The system is as His Dudeness describes but his decription makes it sound as though it is for stall prevention, quite simply the system prevents the control forces becoming too light with an aft c of g (essentially what His Dudeness stated). With very light control forces then pulling up into a stall too easily is obvioulsy a possibility but with the control force too light it can become very difficult to hold a steady attitude. Longitudinal static stability (controls free) is measured as a function of control force on the stick in relation to speed change, the SAS on the Cheyenne is therefore a Stability Augmentation System and not a Stall prevention System.
Yes correct, have lots of experience with both systems,
Piper and
Swearingin, the system seemed to do it's job fine as long as techs were able to calibrate it properly, no problems with SAS or SAS squared.