Originally Posted by
pbaumer2
Hello everyone,
I am reading the type certification document of the CT7 engine, and I am surprised that there is no exhaust gas temperature limit listed among Operational Limits. Instead Maximum Gas Generator Inter-Turbine Temperature (T4.5/ITT) is given. I am curious to know how the pilot interprets this value or is there some hardware which reads and displays warnings based on the T4.5?
Thank you,
Paul
In general terms: EGT, ITT, TIT, T4, MGT, etc basically indicate what position on the engine the temperature is taken. Most exhaust thermocouple locations are determined by type of turbine engine, manufacture design, etc.
You'll find most free-turbine turboshaft engines (rotorcraft) will monitor the temperature in the middle of the engine (ITT, T4) whereas in a turbo-jet engine (fixed wing) they'll monitor the temp at the ends (TIT, EGT).