Which action enables derated takeoff thrust in the FMS?

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Multiple Choice

Which action enables derated takeoff thrust in the FMS?

Selecting a fixed takeoff derate in the FMS is the way to apply a known, constant thrust reduction for the takeoff phase. When you choose this option, the FMS uses a predefined derate value (as specified by airline procedures or performance data) and applies that reduction to the takeoff thrust setup for the entire takeoff. This yields a consistent thrust setting regardless of changing weight or other factors, which is exactly what you want for predictable performance and compliance. Derating by adjusting weight doesn’t change the thrust command itself; weight affects acceleration and speeds, but the FMS derate mechanism needs a direct derate setting. The idea of a dynamic derate implies a variable reduction during takeoff, which isn’t the standard method for applying a fixed, known derate in the FMS. And the option that it isn’t possible is incorrect because the fixed takeoff derate feature is a supported, common function used to meet performance and certification requirements.

Selecting a fixed takeoff derate in the FMS is the way to apply a known, constant thrust reduction for the takeoff phase. When you choose this option, the FMS uses a predefined derate value (as specified by airline procedures or performance data) and applies that reduction to the takeoff thrust setup for the entire takeoff. This yields a consistent thrust setting regardless of changing weight or other factors, which is exactly what you want for predictable performance and compliance.

Derating by adjusting weight doesn’t change the thrust command itself; weight affects acceleration and speeds, but the FMS derate mechanism needs a direct derate setting. The idea of a dynamic derate implies a variable reduction during takeoff, which isn’t the standard method for applying a fixed, known derate in the FMS. And the option that it isn’t possible is incorrect because the fixed takeoff derate feature is a supported, common function used to meet performance and certification requirements.

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