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The IAE 2527 A5 engine is flat rated up to ISA +31 at sealevel,therefore it requires the same EPR setting at all temp below Tref. The engine is limited for mechanical reasons in this reason. When above Tref the engine is limited by the heat generated and the EPR is reduced so as not to overheat the engine. The main reason for engine wear is excessive heat and the best way of saving the engine is to reduce the heat. This is done by reducing EPR using a Flexible take off.
Questions:
1- What does it mean when he say its flat rated to XXX? I have no idea what is Tref....
2-Where can u find the info as to what the engines are flat rated to? Not in the fcom i think.
Thanks.