What is the primary purpose of the crossfeed system?

The primary purpose of the crossfeed system in an aircraft is to provide flexibility in fuel management by allowing any engine to be fed fuel from any fuel tank. This capability is especially valuable in multi-engine aircraft, where fuel may become imbalanced due to uneven consumption or adjustment needs during flight operations. With the ability to select fuel from various tanks, pilots can maintain optimal aircraft performance, balance, and safety. In situations where one tank may run low, the crossfeed system ensures that fuel availability is maximized and can be directed to engines as needed, ultimately supporting more efficient and safe flight operations.

In contrast, transferring fuel between tanks is a different function handled by fuel transfer systems, while monitoring fuel levels is managed through different indicators and sensors within the fuel system. Enhancing fuel efficiency is a broader goal of overall fuel management rather than the specific function of the crossfeed system.