Where is ITT (intermediate turbine temperature) typically measured?

• A. In the exhaust
• B. In the hot section inside the turbine/gas path
• C. In the oil sump
• D. At ambient

Answer: (B)

ITT is measured in the hot section of the turbine/gas path because it reflects the actual temperature the turbine blades encounter as the combusted gas enters the turbine. Sensors are placed in the turbine inlet area or just inside the hot path to monitor the highest, most critical temperature for blade cooling and material limits. Measuring in the exhaust would show gas after expansion and cooling, not the condition the blades see; oil sump temperatures relate to lubrication rather than the gas path, and ambient temperature doesn’t represent engine operating conditions. So the hot section measurement provides the relevant, actionable data for turbine performance and protection.