What is the unusable fuel amount for the PC-12 NGX?

• A. 20.5 lbs
• B. 32.9 lbs
• C. 45.0 lbs
• D. 60.0 lbs

Answer: (B)

Unusable fuel is the portion of fuel that cannot be drawn from the tanks to the engine due to the fuel system’s geometry and pickup locations. As the tanks empty, the fuel pickups sit above the remaining liquid, and at a certain point the pumps can no longer suck fuel, so that small amount stays behind. This fixed amount is defined by the aircraft’s tank design and fuel-pickup positions and is included in flight planning as fuel you cannot rely on.

For the PC-12 NGX, this unusable amount is 32.9 pounds, which is about 4.9 gallons of Jet-A. That means usable fuel is total capacity minus roughly 32.9 pounds. The other numbers would correspond to different tank designs or pickup limitations, which the NGX does not have.