The maximum continuous ITT temperature is:

The maximum continuous ITT temperature is:

• A. 600 degrees C
• B. 680 degrees C
• C. 700 degrees C
• D. 750 degrees C

Answer: (B)

Interturbine temperature is the turbine inlet temperature and is a critical limit because turbine blades are subjected to extreme heat and stress. The maximum continuous ITT is the highest temperature you can sustain for an extended period without damaging the turbine materials and reducing engine life. For the Beechjet 400A engine, that continuous limit is 680 degrees Celsius. This value is set lower than the limits used for short-duration high-thrust phases (like takeoff), which can tolerate higher ITT for only brief moments. So, 680°C is the correct choice because it represents the highest ITT you can maintain continuously without compromising engine health. The other numbers correspond to either non-maximum continuous limits or transient limits allowed only briefly during high-thrust maneuvers.

Interturbine temperature is the turbine inlet temperature and is a critical limit because turbine blades are subjected to extreme heat and stress. The maximum continuous ITT is the highest temperature you can sustain for an extended period without damaging the turbine materials and reducing engine life. For the Beechjet 400A engine, that continuous limit is 680 degrees Celsius. This value is set lower than the limits used for short-duration high-thrust phases (like takeoff), which can tolerate higher ITT for only brief moments. So, 680°C is the correct choice because it represents the highest ITT you can maintain continuously without compromising engine health. The other numbers correspond to either non-maximum continuous limits or transient limits allowed only briefly during high-thrust maneuvers.