Which statement best describes the required crossflow configuration for takeoff?

Which statement best describes the required crossflow configuration for takeoff?

• A. Off
• B. On
• C. Auto
• D. Manual

Answer: (A)

Fuel crossflow controls whether fuel can be transferred between left and right wing tanks. For takeoff, keep crossflow off so each engine feeds from its designated tank and there’s no uncommanded movement of fuel between tanks during a critical phase. This helps maintain a stable center of gravity and predictable engine fuel supply as thrust ramps up. If crossflow were on, fuel could shift between tanks due to pressure differences created by changing thrust, potentially causing a temporary imbalance or complicating fuel management right when precise control is essential. Auto or manual modes add variability during takeoff, either by enabling crossflow automatically or requiring pilot input at a moment when quick, decisive action is needed. Therefore, the recommended configuration for takeoff is off.

Fuel crossflow controls whether fuel can be transferred between left and right wing tanks. For takeoff, keep crossflow off so each engine feeds from its designated tank and there’s no uncommanded movement of fuel between tanks during a critical phase. This helps maintain a stable center of gravity and predictable engine fuel supply as thrust ramps up. If crossflow were on, fuel could shift between tanks due to pressure differences created by changing thrust, potentially causing a temporary imbalance or complicating fuel management right when precise control is essential. Auto or manual modes add variability during takeoff, either by enabling crossflow automatically or requiring pilot input at a moment when quick, decisive action is needed. Therefore, the recommended configuration for takeoff is off.