Why do multi-engine airplanes utilize fuel crossfeed systems?

Multi-engine airplanes utilize fuel crossfeed systems to allow any engine to draw fuel from any tank. This capability provides significant operational flexibility and enhances safety. In the event of a fuel imbalance or if an engine or fuel tank becomes inoperative, the crossfeed system enables pilots to transfer fuel to ensure that all engines have adequate fuel supply, thus maintaining performance and controlling weight distribution.

By using the crossfeed system, pilots can also manage fuel consumption more effectively. For instance, if one tank has a higher fuel level than another, fuel can be drawn from the fuller tank to balance the load. This helps in managing the aircraft's center of gravity, despite the fact that it directly addresses imbalances rather than minimizing overall fuel consumption or simplifying management. It also doesn’t inherently aim to simplify fuel management, although it may make managing fuel load more adaptable to changing conditions.

This operational capability is crucial in enhancing the reliability of multi-engine airplanes, allowing them to continue flying safely if one engine has problems or if there is an unexpected change in fuel status.