If my memory serves me correctly, when the Bell 412 auto pilot is operating in the dual channel mode, each channel’s SAS actuator operates at 50% authority at half gain. This allows for a corrective response should one channel experience a hard over. With one channel failed the remaining channel has to work at 100% authority with double the gain. In this case, there is no corrective response should the remaining channel experience a hard over. At speeds greater than 115 KIAS the aircraft’s response to a hard over during single channel operations could be pretty exciting.