Powered crossflow and gravity crossflow must be ___ for takeoff.

• A. On
• B. Off
• C. Auto
• D. Not required

Answer: (B)

The setting is about keeping the engine’s feed clean and predictable during takeoff by preventing alternate flow paths from taking over. Powered crossflow and gravity crossflow are ways fluids or air can be moved between parts of a system, which could alter fuel distribution or airflow if they activate at the wrong moment.

Turning both crossflow paths off ensures the engine and fuel system draw from their intended sources with stable pressure and flow. If crossflow were allowed to operate, even briefly, it could cause uneven fuel delivery or unexpected pressure changes just as you’re applying maximum thrust, which is not desirable for a smooth, reliable takeoff. An automatic setting could switch on unpredictably, and leaving them on would contradict the requirement for a controlled, single-path flow.