The High Turbine Gas Temperature (TGT) limiting setpoint is at what temperature?

• A. 800 degrees Celsius
• B. 900 degrees Celsius
• C. 1000 degrees Celsius
• D. 850 degrees Celsius

Answer: (C)

Turbine gas temperature is a critical parameter that defines the maximum safe temperature the turbine can experience without risking damage to blades and shrouds. The engine control uses a hard limit at 1000 degrees Celsius to protect the turbine from thermal overstress and accelerated wear. When TGT approaches this limit, the FADEC reduces fuel flow to keep the temperature from exceeding it; if necessary, it will further reduce power to stay within safe margins. The other temperatures shown are lower values and do not represent the official limiting setpoint for normal operation; the 1000 C limit is the value that defines the allowable maximum.