Flex/Derate take-off
I have a question regarding this topic. When you use a flexible or derated take-off, you have an assumed temperature greater than the OAT for a given weight of the aircraft. Using the assumed higher temperature, you apply a TO/GO throttle setting lower than the maximum TO/GO throttle setting for the actual OAT and weight of the aircraft.
The concept I'm stuck on is the thrust setting. If you assume that the OAT is higher than the actual, the density is lower and therefore the aircraft needs an advanced throttle setting for the same TO/GO thrust at the actual OAT. That would mean the complete opposite to my first paragraph.
Or does the higher assumed OAT got to do with the Turbine Inlet Temperature?
Thanks.