Total usable fuel (standard)?

Total usable fuel (standard)?

• A. 24.0 US gallons
• B. 24.5 US gallons
• C. 25.0 US gallons
• D. 26.0 US gallons

Answer: (B)

Total usable fuel is the amount you can actually draw from the tanks during flight, not the total tank capacity. Some fuel remains unusable because of tank geometry and the fuel pickup limits, so the published figure for usable fuel reflects what you can rely on for planning. For this aircraft in standard configuration, the two wing tanks provide 24.5 US gallons of usable fuel in total. This is the figure used for flight planning and endurance estimates, even though the tanks may hold more than that. The other numbers would imply more or less usable fuel than the published standard, which is why 24.5 US gallons is the correct choice.

Total usable fuel is the amount you can actually draw from the tanks during flight, not the total tank capacity. Some fuel remains unusable because of tank geometry and the fuel pickup limits, so the published figure for usable fuel reflects what you can rely on for planning.

For this aircraft in standard configuration, the two wing tanks provide 24.5 US gallons of usable fuel in total. This is the figure used for flight planning and endurance estimates, even though the tanks may hold more than that. The other numbers would imply more or less usable fuel than the published standard, which is why 24.5 US gallons is the correct choice.