No.1 and No.2 fuel cells each contain how much unusable fuel?

No.1 and No.2 fuel cells each contain how much unusable fuel?

• A. 50 lbs
• B. 9 lbs
• C. 22 lbs
• D. 0 lbs

Answer: (B)

Unusable fuel is the small amount in each fuel cell that the engine can’t draw under normal operation because the fuel pickup can’t reach it in all attitudes and during normal pump operation. It’s built into the design to ensure the engine always gets fuel even when the tank is tilted or riding near the bottom. For this aircraft, the fixed unusable amount per cell is nine pounds. That value comes from the tank geometry and pickup position, which determine how much fuel will inevitably remain inaccessible. So each of No.1 and No.2 fuel cells contains nine pounds of unusable fuel. (That’s roughly about 1.3–1.5 gallons depending on fuel density.)

Unusable fuel is the small amount in each fuel cell that the engine can’t draw under normal operation because the fuel pickup can’t reach it in all attitudes and during normal pump operation. It’s built into the design to ensure the engine always gets fuel even when the tank is tilted or riding near the bottom.

For this aircraft, the fixed unusable amount per cell is nine pounds. That value comes from the tank geometry and pickup position, which determine how much fuel will inevitably remain inaccessible. So each of No.1 and No.2 fuel cells contains nine pounds of unusable fuel. (That’s roughly about 1.3–1.5 gallons depending on fuel density.)