Aviation Institute Of Maintenance (AIM) Block 1 Practice Test

What is the approximate weight of one gallon of average fuel?

6 lbs 5 lbs 7 lbs 8 lbs

Correct Answer:

6 lbs

Explanation:

Weight of fuel is found by multiplying its density by the volume. A gallon is a unit of volume, and aviation fuels have densities such that a rough rule of thumb is about 6 pounds per gallon. This convenient figure is widely used for quick planning and maintenance calculations, even though the exact weight can vary with fuel type (Jet fuel versus AVGAS) and temperature. In practice, Jet A is slightly heavier (around 6.7 pounds per gallon at standard conditions) and AVGAS is in a similar range, but for rough estimates the six-pound figure is the common, widely taught approximation. So the choice matching that practical value best represents the typical weight of one gallon of average aviation fuel.

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