| A | B |
|---|
| Aviation Gasoline per Gal | 6 pounds |
| Jet Fuel per Gal | 6.7 pounds |
| Engine Oil per Gal | 7.5 pounds |
| Gross Weight | Empty weight plus fuel, crew, and payload |
| Basic Empty Weight | Weight of aircraft, oil, and unusable fuel |
| Useful load | weight of fuel, crew, and payload |
| Unusable Fuel | Fuel that cannot be safely used in flight or drained on the ground. |
| Payload | The weight of passengers, baggage, and cargo. |
| Useful load | The difference between the basic empty weight and the maximum allowable weight. |
| Usable Fuel | The fuel available during flight. |
| Maximum Ramp Weight | Maximum weight allowed for ground operations |
| Maximum Takeoff weight | Maximum weight allowed for flight |
| Maximum Landing Weight | Maximum weight allowed for landing. |
