What is EGT and why is it monitored during operation?

• A. Ambient temperature in the intake duct.
• B. Oil temperature in lubrication system.
• C. Exhaust Gas Temperature; indicates turbine inlet temperature and fuel-air ratio; abnormal EGT signals potential over/underfueling or faults.
• D. Backpressure in exhaust system.

Answer: (C)

Exhaust Gas Temperature is the heat of the gases after combustion as they enter the turbine. It’s monitored because it directly reflects the turbine inlet temperature and the fuel-air ratio being used. Keeping EGT within limits protects turbine blades and nozzles from overheating and helps ensure efficient combustion. If EGT climbs, it can indicate overfueling or a fault in the fuel control; if it drops or trends abnormally, it may signal underfueling, ignition issues, or air leaks. Monitoring EGT provides early fault detection and lets the fuel system adjust to keep operation safe and efficient. This parameter is distinct from ambient intake temperature, oil temperature, or exhaust backpressure, which relate to other aspects of the engine’s performance.