Good morning,
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I was reading about flex to temp on the bus.
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Basically, as air get's cold, more it get's denser (more air molecules).
So if air is hot, less you have air molecules so you won't be able to get the required thrust (so the turbine will not turn).
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So you basically tell the plane that the outside temperature is very hot (not true), so the plane will think that as the outside temperature is already very hot, if you add to much fuel (and compress a lot), the temperature will get to high and the air (+ fuel) won't be able to turn the turbine to get thrust.
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FLEX TEMP = TOGA with the selected temperature.
So if you enter 50°, it means that if the outside temperature would have really been of 50° and if you would have used TOGA, then you would have got the Flex temp.*
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At a certain temperature, air + fuel won't be able to produce thrust (mostly no air molecules).*
If the outside air temperature is very cold, we will be able to use more fuel and get a higher RPM.
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1) Am I right?
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2) So with TOGA, you won't get 0,001% thrust more. So does FADEC use the outside temperature to calculate the required amount of fuel to turn the turbine/fan at the highest RPM possible? So the temperature and the weight of the plane is very important...am I right?*

Thanks a lot!