Can the reason for the restriction be because of the lower thrust setting in the DDG? If you factor in a roll increase to maintain N1 within engine limits you couldn't count on those extra N1 figures for performance reasons..
No,the restriction is there so the fact of possible n1 increase during roll out does not go beyond the n1 limit for temp and pressure for the engine rating.
To reduce the take off N1 ,your take Off limit weight is restricted by a certain weight value in the AFM DPI section....
but I still don't get the EEC in alternate.
Sometimes ass temp is just not the priority of the day....EEC in alt mode is one.
Sorry,i am not sure but it .could be as simple as boeing can not know the temp the EEC in its reversion mode(alt) and therefore cannot provide assum temp table as climb and runway limit need the info of actual OAT.
Just a guess and stand to be corrected
