Hi Check Airman,
A previous poster mentioned that BA doesn't allow the AT to be disconnected.
I don't know the present position, but it was true many years ago.
There were several SESMA events on the Airbus fleet when crews were taking the auto-thrust out in order to "practice for their next sim check". This was a case of the tail wagging the dog. Extra sim practice with AT off was then given to the Airbus crews.
There was no AT restriction on Boeing crews, since all manual flight is conducted with the AT off due to the pitch/power couple (& advantage of feed back loop "feels heavier when slow" etc).