What fuel limitation prohibits takeoff?

The correct answer indicates that takeoff is prohibited when there is partial wing fuel combined with fuel in the fuselage tanks. This limitation is crucial for ensuring the aircraft's fuel balance and system integrity during takeoff. If the wings are not adequately fueled, it can lead to an imbalance that affects the aircraft's handling characteristics and stability during critical phases of flight like takeoff.

The fuselage fuel tanks are typically designed to support certain operational scenarios but should not be carrying a greater volume than what's safely manageable in the wings during takeoff. When there is fuel in both the fuselage and partial fuel in the wings, it may not provide the adequate center of gravity (CG) required for a safe takeoff. Ensuring proper weight distribution and fuel management is vital to maintain control and performance of the aircraft during takeoff.

This understanding underscores the significance of adhering to aircraft limitations, as it ensures safety and compliance with operational standards.