What's wrong with calling it a ap rudder channel.
Don't know, ask Mr Boeing, I only fly the things...
Does that mean it'll keep it straight in the event of an engine failure? Or just provide assistance
It provides significant assistance, whilst leaving the pilot(s) to do some of the foot work and any required trimming.
The bus will keep straight until alpha prot, then ap disconnect and a descent.
Excellent.....
Any triple drivers?
Err, Hello, .....or do you want
another triple driver