To use derated takeoff thrust, what data is required?

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Multiple Choice

To use derated takeoff thrust, what data is required?

Derated takeoff thrust changes the engine output, so you must use performance data that match the exact derate setting you intend to use. The published charts for a derate level are built specifically for how that reduced thrust interacts with weight, flap setting, ambient conditions, and runway length. Using data for full takeoff thrust would misrepresent performance and could lead to unsafe or noncompliant results. Weight and balance data are always needed, but they don’t substitute for derate-specific performance data. Therefore, you need takeoff performance data for the specific fixed derate level.

Derated takeoff thrust changes the engine output, so you must use performance data that match the exact derate setting you intend to use. The published charts for a derate level are built specifically for how that reduced thrust interacts with weight, flap setting, ambient conditions, and runway length. Using data for full takeoff thrust would misrepresent performance and could lead to unsafe or noncompliant results. Weight and balance data are always needed, but they don’t substitute for derate-specific performance data. Therefore, you need takeoff performance data for the specific fixed derate level.

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