Did I read it wrong? I took the meaning of 'Autopilot disengage if Autopilot B in use' to mean 'you should disengage autopilot B if engaged', which, logically, you should do. If it means 'the autopilot will disengage itself if autopilot B in use', then no, that is not correct as it will indeed stay engaged, and I did say 'You don't want to continue using it, so engage A' meaning autopilot B will still be engaged, but you don't really want to use it when you have A available with a full Nav picture. Sorry if I caused confusion!