Thats useful-
Originally Posted by Tee Emm
However, from 40% to rated thrust for both throttles at the same rate of movement, the tolerance is only one second. Using normal autothrottle procedure of manually pushing the throttles to approximately the 40% position then selecting TOGA, the throttles are programmed to advance to within 8% N1 of the selected take off thrust - then a slight hesitation - then they advance to the selected take off power.
Coincidence?
The 8% that you mention may well be the point where that one thrust lever feels like it has completely stopped, or feels as if it is pushing back. It certainly holds there for what seems a very long time. Longer runways where we are never limited, maybe not such a concern. Some of our more limiting cases are another matter.
I shall Have to look into this further.