Question: if autopilot and autothrottles were engaged, does manual input disengage the A/P?
The A/T will not disengage if you override it, to be able to apply full thrust and have them stay there, the A/T need to be disconnected.
Does the 767 do anything like this? Or can you hold enough back pressure to maintain an altitude without A/P disconnect?
The 76 has weak servos on the A/P system, you can override it and make control inputs, but the A/P will eventually disconnect if the inputs are extreme.