After how many seconds will the transfer valve close if a fuel imbalance of 20 pounds is detected?

The transfer valve is designed to automatically close when a certain fuel imbalance is detected to maintain balance and optimize aircraft performance. In this case, the correct answer identifies that after a fuel imbalance of 20 pounds is detected, the transfer valve will close after 20 seconds.

This timing is established as a safeguard mechanism, allowing the aircraft's systems to respond effectively to fuel distribution changes without immediate disruption. This timeframe also ensures that the system is able to assess the situation adequately and provide time for potential corrective actions before sealing off the fuel transfer process.

Understanding this timing is crucial for operational awareness and ensuring that the aircraft operates within its optimal fuel management parameters.