FAA Aviation Mechanic Powerplant (AMP)Fuel, Induction and LubricationMedium
An aircraft's fuel tank has a usable capacity of 52 gallons of 100LL aviation gasoline. If avgas weighs 6 pounds per gallon, what is the total fuel weight when the tank is full?
- A364 pounds
- B346 pounds
- C260 pounds
- D312 pounds
Show answer & explanationAnswer & explanation
Correct answer: D. 312 pounds
Total fuel weight = 52 gallons × 6 lb/gallon = 312 pounds. Aviation gasoline is standardly calculated at 6 pounds per gallon for weight and balance purposes.
Why the other options are wrong
- A. This value corresponds to a jet fuel weight calculation (6.7-7 lb/gal), not avgas.
- B. This does not match the standard 6 lb/gal calculation.
- C. This would result from an incorrect multiplier below 6 lb/gal.
Aviation Gasoline Weight Calculation
Avgas is standardly calculated at 6 pounds per gallon for weight and balance purposes.
- Avgas density: 6 lb/gallon (standard)
- Jet fuel density: approximately 6.7-7 lb/gallon depending on type
- Fuel weight = gallons × pounds per gallon
Memory trick: Six pounds a gallon keeps avgas math simple