Ptkay, this is text in Russian for you to google into English, describing how CAY-154-2 works. "Simply saying, System of Automated Piloting 154-2 is an autopilot, providing stabilisation of the airplane by the channels of crane and tangage. These channels are independent. Can work in different regimes/modes. It is possible to have automated piloting by one channel - and hand piloting by the other. Depending on the regime/mode switched on the system provides: " - see there a list.
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PS Hello everybody :o), I got a call to be back and translate a bit where needed :o)