What is the effect of burning 35 gallons of fuel on the weight and balance of an airplane that weighed 2,890 pounds at takeoff?

Burning fuel reduces the overall weight of an airplane, as fuel is one of the significant components of an aircraft's total weight. In this case, if you start with an airplane that weighed 2,890 pounds at takeoff and you burn 35 gallons of fuel, you need to know the weight of the fuel being consumed to find the new weight of the airplane.

A gallon of aviation gasoline weighs approximately 6 pounds, so burning 35 gallons equates to a weight loss of about 210 pounds (35 gallons multiplied by 6 pounds per gallon). This weight reduction brings the total weight of the airplane down to 2,680 pounds.

Furthermore, as fuel is burned, it typically affects the center of gravity (CG) of the airplane. In many configurations, burning fuel causes the CG to move aft, especially when the fuel is located in wing tanks. If the weight loss from burning the fuel causes the CG to go out of limits (in this case, too far rearward), it can create issues with airplane stability and control.

Therefore, with both considerations—the reduction in weight by 210 pounds and the potential shift of the CG to an unsafe aft position—the correct response reflects the impact of fuel burn on both weight and