Unusable fuel capacity value (as listed) is which of the following?

Unusable fuel capacity value (as listed) is which of the following?

• A. 0.75 US Gallons
• B. 1.0 US Gallon
• C. 2.0 US Gallons
• D. 1.5 US Gallons

Answer: (D)

Unusable fuel capacity is the fixed amount of fuel that remains in the tanks and cannot be used for flight because of how the fuel pickup and tank geometry work. It’s the leftover you still have when the system is effectively empty. For this aircraft, that fixed leftover is 1.5 US gallons, so that is the value listed as unusable. The other numbers would imply different leftover amounts than the aircraft’s design specifies, so they don’t match the listed data.

Unusable fuel capacity is the fixed amount of fuel that remains in the tanks and cannot be used for flight because of how the fuel pickup and tank geometry work. It’s the leftover you still have when the system is effectively empty. For this aircraft, that fixed leftover is 1.5 US gallons, so that is the value listed as unusable. The other numbers would imply different leftover amounts than the aircraft’s design specifies, so they don’t match the listed data.