The high ITT engine is degraded or damaged in some way. In order to generate as much thrust as the "good" engine, it is burning more fuel/requires more heat and it's not being usefully used, hence the higher than normal turbine temp. Compressor damage (lower pressure ratio= less thermal efficiency), leaky surge bleeds, degraded turbine (pressure/temp drop across the turbine is in line with power extraction and is a known quantity at the design stage). Is there a mismatch between N1 & N2? More info required. Line up the fuel flows and tell us what the other parameters do.
Last edited by Private jet; 5th Jul 2022 at 20:14.