Originally Posted by
AerocatS2A
The numbers go 1.0 to 1.2 but there is a tick mark at 1.1 and all you need to do to get 1.05 is set the donuts halfway between 1.0 and the 1.1 tick. Easy as.
Exactly. Although an untrained eye will be putting it onto 1.1 tickmark which is approximately the same angular location as 50% n1 on the CFM - a common cognitive slip. Why no mark at 1..05 is a bit of a HF puzzle.
The jump from 1.1 to 1.2 probably refers to N1 exclusion zone on the IAE, where fadec refuses to command a setting within a specified vibration zone, resuliting in non-linear thrust control. No FCOM at hand, something like 62-75 N1.