Originally Posted by
LLuCCiFeR
From the QRH: i.e. you can overboost the engines.
But by how much. I believe that overboost is different than overspeed of N1 or N2. In other words. I think that one can be overboosted but within rotational speed limits.
But as the throttle is moved forward while in alternate do the N1 and N2 speeds continuously increase and therefore if you move the throttle forward too much such as in a poorly executed addition of go-around thrust, you will have 4 engines at idle.