AIR_70_MACH_0_CORRECTED_COMMANDED_NE and AIR_70_MACH_HI_CORRECTED_COMMANDED_NE are the .air file tokens associated with CN1. See SDK sample TurboPropSample.asm for explanation. These two tables effectively map calculate a commanded corrected N1 based on throttle, mach, and atmospheric pressure ratio.

Hope this helps,
Mike

Yeah, looking a little closer at the code... those tables basically set a target N1 for the fuel controller, which increases/decreases fuel necessary to achieve the the target. Then N1 is linked to that fuel calc. Unfortunately, that relationship is hardcoded, which explains what you are experiencing. In effect, those tables can affect the dynamics of N1, but within that range. "fuel_flow_gain" in the .cfg is effectively the time constant on this if you're interested in adjusting rates.

Mike

Not that we can do anything about it right now, but what relationship is it that you need to model?

Mike

Yep, understood on the Ng limits. As for FF, the property TURB_ENG_CORRECTED_FF does actually work appropriately. Unfortunately, it is used as an internal state parameter within the turbine code and not directly linked to the fuel demand code. There were some legacy implementation reasons for this at the time.

Mike

Yes, but it's only used as a intermediate term within the turbine calculations. It is not used for the actual fuel consumption. You'll have to choose if you want the indication to be more appropriate or if the fuel consumption should correspond exactly with this rate.

No, because it is not linked to the fuel demand code - that's separate code. Choose your poison

No, it is not intended to be used for fuel consumption calculations. It is only there to model a fuel controller to in the relationship between commanded N1 and actual N1. Independently, we model fuel flow for purposes of fuel consumption. In modeling and tuning dependent relationships like this, it sometimes helps to separate things a bit so that one can tune one aspect without upsetting the other. e.g. for MSFS it was important to make actual fuel burn more tunable, without secondarily affecting N1, power, etc... So, pretend "TURB_ENG_CORRECTED_FF" is named something else, but it just so happens that it sort of has the dynamics of free turbine fuel flow.
My point previously was that if your boss's training scenario is centered around cockpit procedures and familiarization, some error in the longterm fuelburn may be less of an issue than the current FF indications. But I don't know, it's only a suggestion for you to try.

Mike