What is the maximum allowable refueling imbalance?

• A. 2,000 lbs
• B. 2,500 lbs
• C. 3,000 lbs
• D. 1,500 lbs

Answer: (B)

Balancing fuel between left and right tanks is essential to keep the airplane’s center of gravity and roll stability within safe limits. A refueling imbalance creates a lateral load that acts like a rolling moment; if the imbalance is too large, it becomes harder to keep the wings level, especially during critical phases of flight or if an engine isn’t providing equal thrust. The 2,500-pound limit is set to provide enough tolerance for ground refueling and in-flight adjustments while ensuring the aircraft stays within the approved CG envelope and remains easily controllable. Imbalances smaller than this would unduly constrain fueling procedures, while imbalances larger than this could compromise stability and handling.