What maneuver can enhance the transfer when utilizing gravity crossflow in flight?

The correct response highlights the effectiveness of a sideslip maneuver in enhancing the transfer of fuel when using gravity crossflow in flight. When the aircraft is placed in a sideslip, one wing is lowered while the other is raised, creating a horizontal lift component that can shift the fuel's center of gravity toward the lower wing's side. This gravitational force assists in directing the fuel towards the intended tank, improving the efficiency of the crossflow process.

In contrast, employing a bank turn could potentially inhibit fuel transfer due to the redistribution of aerodynamic forces, while a steep descent may not effectively influence the fuel movement in the tanks. Likewise, maintaining level flight would not generate any additional gravitational assistance to encourage the fuel to flow from one tank to another. Therefore, the sideslip maneuver stands out as the optimal technique for promoting effective gravity crossflow during flight.