Definition
The process of managing fuel quantities between an aircraft's left and right wing tanks (or other paired tanks) so that the weight remains roughly equal on both sides, preserving lateral balance during flight. In aircraft equipped with a crossfeed system, fuel balancing is typically achieved by selecting fuel from the heavier tank to feed the engine(s), or by using crossfeed to draw fuel from one side to supply the opposite engine on multi-engine airplanes.
Plain English
Keeping the amount of fuel in the left and right wing tanks close to equal so the airplane doesn't become heavier on one side than the other.
Context Anchor
Seen in fuel system procedures, especially when using crossfeed or managing fuel from multiple tanks during flight.
Derivation
Fuel means material burned to produce power. Balance comes from the idea of a weighing scale. In aviation, that helps because fuel is weight, and uneven fuel weight can make the airplane harder to handle.
Why Pilots Care
Uneven fuel creates a rolling tendency toward the heavier side, raising workload and reducing safety margins.
Intuition Check
Fuel balancing does not mean using any tank in any order just to make the gauges match. It means following the airplane’s approved fuel procedures to keep fuel weight within safe limits.
Example Sentence 1
Noticing the left tank was 15 gallons lower than the right, the pilot used crossfeed to begin fuel balancing before the imbalance grew larger.
Example Sentence 2
Continued fuel balancing kept the wings level without constant aileron pressure.