When is the Auto-Balance System deactivated in the Pilatus PC-12 NG?

The Auto-Balance System in the Pilatus PC-12 NG is specifically designed to maintain an even distribution of fuel between the left and right fuel tanks during flight. The system will deactivate when the fuel levels in both tanks are equal. This ensures that the aircraft maintains a balanced center of gravity, which is crucial for optimal flight performance and safety.

When the fuel is equal in both tanks, the necessity for automatic balancing is eliminated, as there is no longer any discrepancy that needs correction. This allows the pilot to manage fuel independently or switch to manual operation if needed, while being informed of the fuel status through the aircraft's monitoring systems.

The other choices refer to specific conditions that may not directly relate to the operational logic of the Auto-Balance System. For example, fuel transfer completion or reaching a specific weight does not necessarily indicate that the fuel tanks are balanced. Thus, the most appropriate condition for deactivation is having equal fuel in both tanks.