Which option is NOT a max takeoff parameter?

Which option is NOT a max takeoff parameter?

• A. 105% N1
• B. 105% N2
• C. 920°C ITT
• D. 950 ITT

Answer: (D)

Takeoff limits are defined by the specific values the engine is allowed to reach during takeoff: the speeds N1 and N2 are capped at a certain percentage, and the inter-turbine temperature (ITT) is limited to a takeoff maximum. In this context, the takeoff envelope uses N1 up to 105%, N2 up to 105%, and an ITT limit of 920°C. These are the values that define the maximum permissible conditions for a safe takeoff. A temperature of 950°C exceeds the designated takeoff ITT limit, so it is not considered a valid max takeoff parameter. Therefore, 950 ITT is not a max takeoff parameter.

Takeoff limits are defined by the specific values the engine is allowed to reach during takeoff: the speeds N1 and N2 are capped at a certain percentage, and the inter-turbine temperature (ITT) is limited to a takeoff maximum. In this context, the takeoff envelope uses N1 up to 105%, N2 up to 105%, and an ITT limit of 920°C. These are the values that define the maximum permissible conditions for a safe takeoff. A temperature of 950°C exceeds the designated takeoff ITT limit, so it is not considered a valid max takeoff parameter. Therefore, 950 ITT is not a max takeoff parameter.