Heya QAV.. .As you know most of our 767's have the CF680C2B6, and the newest one has the FADEC "F" at the end.. .On the non-FADEC aircraft there will be a split in N1 values, and you must manually equalise the engines yourself, which will result in staggered thrust levers.. .On the FADEC aircraft, provided the thrust levers are within one "knobs" width of each other, the FADEC system will ensure both engines produce exactly the same N1.. .I am unsure if the FADEC aircraft suffer from the N1 split during descent, however I doubt they would. I am getting very tired of the Idle Disagree non-normal checklist.....