"When climbing in FLCH the computer will try to change altitude in approx. 2mins with variable thrust up to rating one or max climb thrust depending what you have selected. If it can't do it in under 2mins it gives you the max thrust for the rating you have selected".
I have been flying the GE and PW variant of the 744 for years and I have never heard of this two minute variable thrust climb logic. I believe it only applies to the software in the RR powered variant. Anyone??