What is the maximum ITT allowed for normal operations?

• A. 750
• B. 800
• C. 820
• D. 825

Answer: (A)

You’re testing the continuous, steady-state limit for the engine. Interturbine temperature (ITT) is a critical heat measure in a turbine engine; if it gets too high for too long, the turbine blades can be damaged. For normal, non-emergency operation, the ITT limit is set as a continuous (sustained) value that the FADEC system keeps you under. In this case, that continuous limit is 750°C, so you should keep ITT at or below 750°C during normal operations. Higher temperatures are allowed only for brief, takeoff or maximum-thrust conditions, when the engine is permitted to spike up to the higher, short-duration limits. The engine management system will automatically reduce fuel or throttle to prevent exceeding the continuous limit, ensuring engine life and safe operation.