This is the false information most pilots do not understand COMPLETELY, on a FADEC engine you can not exceed the limits the company you work for has provided to you. The engine is often rated for much more and certified for allot more than rated thrust, you just have no access to that thrust.
well, yes. today with all the electronics the same engine may be rated in different maximum thrusts, thats right- like eg. the cfm56-7b which is available in a wide range of rated thrust. and at low temperatures and a flat rated engine this maximum thrust maybe reached far below redlines in EGT or N1. but i think the discussion is how to restore the maxmimum retad thrust from a pilot selected reduced takeoff - and the reducing starts always at the maximum available at a given engine on your plane , not from the highest certified on the engine model family.
you may have on a b737 a cfm56-7b 24K engine - the same core engine produces in another adjustment 26K on another 737. in this case you will never have access to more than 24K, true- but i think it should always be possible to restore your 24K when you derated and started a takeoff with lets say 20K of thrust.
@ FE hoppy: well, like said i,m not a 777 driver, but it sound truly strange. the Vmcg as well Vmca are related to maximum rated thrust on the engine under your wings , so where you loose control applying the max rated when you suddenly need? also all single engine performance is related to maximum rated thrust - you can throw you climb gradients all away when you start derated , one engine fails and you cannot restore max rated power from the other... or do we speak about something different?
like said- we do not discuss a permanent thrust rating setting by the manufacturer -we discuss a pilot selected reduced takeoff rating.
but i may be wrong even when i cannot imagine.