What is the required fuel quantity for a forward extreme conditions CG check on the specified twin-engine aircraft?

The required fuel quantity for a forward extreme conditions center of gravity (CG) check is determined based on the specific operational limits and balance criteria established by the aircraft manufacturer. For many twin-engine aircraft, a quantity of 50 gallons is typically used as it provides a reasonable weight distribution for verifying that the aircraft can maintain stability and control within its designed CG limits, even under the worst-case loading scenarios.

This quantity is often selected to simulate a condition that an aircraft might realistically encounter during operations, ensuring that there is a sufficient fuel weight loaded forward enough to test the aircraft's response during a CG check. The operational characteristics and designs of twin-engine aircraft often necessitate a focus on balance when conducting such checks. Thus, 50 gallons serves as a baseline figure that aligns with the manufacturer's guidelines and safety margins rather than one of the other greater or lesser quantities, which may not accurately reflect the required conditions for this particular inspection task.