thanks mcdhu
mcdhu!
thanks for your concern about my question,up to now,i still haven't got the answer yet.In my opinion( just guess),maybe the FADEC give the number from PERF page to calculate for the engine performance,after calculate based on FLEX T we put in,FADEC decides that with the parameters put in,he must reduce 1 degree to have the best perf for engine.Hop to hear more explan about this.Enjoy your flight!