What position must powered crossflow and gravity crossflow be in for takeoff?

The correct position for powered crossflow and gravity crossflow for takeoff is OFF. This is because during takeoff, it is crucial to ensure that the aircraft systems are configured to prevent any unnecessary fuel flow or air circulation that could lead to complications or malfunctions. Having the crossflow systems turned OFF ensures that fuel is directed as intended for optimal performance.

In specific aviation operations, powered crossflow systems can redistribute fuel to maintain balance, whereas gravity crossflow relies on the natural flow of fuel. However, activating either system during takeoff can introduce risks. Therefore, setting them to OFF guarantees that these systems do not interfere with the essential functions and safety protocols during the initial phase of flight.