With both center tank transfer switches ON and the mode selector in AUTO, the center tank transfer valves will close __________ the center tank is empty.

With both center tank transfer switches ON and the mode selector in AUTO, the center tank transfer valves will close __________ the center tank is empty.

• A. 5 minutes after
• B. Immediately
• C. 10 minutes after
• D. Never

Answer: (A)

In this fuel management logic, the system will not just slam the center tank valves shut as soon as the center tank is reported empty. When both center tank transfer switches are ON and the mode selector is in AUTO, there is a built-in delay to avoid premature or repetitive valve action. Once the center tank becomes empty, the center tank transfer valves will remain open for a short period to confirm the reading and allow any remaining fuel lines or slosh effects to settle. After five minutes of confirmed emptiness, the valves close to isolate the center tank and prevent any inadvertent transfer or crossflow. This 5-minute delay helps prevent valve chatter, reduces wear, and ensures the center tank is truly empty before isolation.

In this fuel management logic, the system will not just slam the center tank valves shut as soon as the center tank is reported empty. When both center tank transfer switches are ON and the mode selector is in AUTO, there is a built-in delay to avoid premature or repetitive valve action. Once the center tank becomes empty, the center tank transfer valves will remain open for a short period to confirm the reading and allow any remaining fuel lines or slosh effects to settle. After five minutes of confirmed emptiness, the valves close to isolate the center tank and prevent any inadvertent transfer or crossflow. This 5-minute delay helps prevent valve chatter, reduces wear, and ensures the center tank is truly empty before isolation.