time-influence-during-engine-start-upTimeCompressor RPMTurbine inlet temperatureIdle RPMrate reachedStartershuts offIgnition offIgnition onFuel inSelf-accelerating RPM rate reached Increase of turbine inlet temperatureindicates successful ignition of thecombustion chamberCombustionchamber ignitionImportant points in time during enginestartup.BAC"A" If startup is too fast, a stall may occur"B" If the temperature becomes too great, the hot parts may overheat"C" The time at idle determines the thermal stresses in the hot parts and also the clearance behavior. It has a great influence on the deterioration LCF life span of the turbine disks.