Gentlemen,
To check my understanding of the flat rating concept,
If we say my engine is flat rated to 30 degrees, then effectively I can acheive rated thrust up to and at this OAT. The engine will absorb more fuel as I chuck it in to overcome the power loss through decreseasing density until, at 30 degrees, the extra fuel and heat gained adiabaticaly through compression, threaten to melt the turbine, cans or other critical part. At this point we see the graph start to drop off in thrust with increasing temperature as the FCU and FADEC do their best to keep the engine within design parameters by reducing fuel flow.
I assume then that flat ratings are also specified with barometric altitude in mind (probably ISA 1013.25Hpa) .
Have I got this right?
