I've had a failure once of the SAS (Stall Avoidance System) in the SWIII Merlin. It has a stick pusher that is controlled by the SAS that receives an input from an angle of attack vane.
Whe were cruising at FL250 with passengers (sleeping) when suddenly the stall warning sounded (very loud horn, like a car horn). Together with that the stick pusher activated and slammed the stick forward, For one second and then the horn and pusher stopped. One second later again the same and it continued like this. Instinctively I cut of the SAS clutch to diconnect the pusher, the stick pusher had activated 3 times by then. Whe could then regain control and take care of the problem.
As we where flying at cruise speed this was a quite scary experience, especially for the passengers.
Bart