On the ground, positioning the thrust levers to the FLX/MCT detent without a flex temperature selected that is higher than the TAT, the resulting N1 limit mode will be which?

On the ground, positioning the thrust levers to the FLX/MCT detent without a flex temperature selected that is higher than the TAT, the resulting N1 limit mode will be which?

• A. Flex
• B. TOGA
• C. MCT
• D. Cont

Answer: (C)

When the thrust levers are in the FLX/MCT detent, the N1 limit is determined by whether a valid flex temperature is available. A flex takeoff requires a flex temperature that is feasible under the current conditions; if no such temperature is selected or if the chosen flex temperature is not appropriate (e.g., not higher than the actual ambient temperature), FLEX cannot be engaged. In that case, the system uses the default maximum continuous thrust limit, so the N1 limit mode becomes MCT. TOGA would require the TOGA detent, and CONT is for non-takeoff continuous operation, not this ground takeoff-prep scenario. Therefore the N1 limit mode is MCT.

When the thrust levers are in the FLX/MCT detent, the N1 limit is determined by whether a valid flex temperature is available. A flex takeoff requires a flex temperature that is feasible under the current conditions; if no such temperature is selected or if the chosen flex temperature is not appropriate (e.g., not higher than the actual ambient temperature), FLEX cannot be engaged. In that case, the system uses the default maximum continuous thrust limit, so the N1 limit mode becomes MCT. TOGA would require the TOGA detent, and CONT is for non-takeoff continuous operation, not this ground takeoff-prep scenario. Therefore the N1 limit mode is MCT.