Refer to figure.
An aircraft has an average consumption of 9.5 USG per hour. If the tanks currently contain 16 US gallons, calculate the minimum additional fuel that must be uploaded in order to complete the flight as planned, including all reserves.
- Average burn: 9.5 USG/hr
- Fuel on board: 16 USG
- 1 US gallon (USG) = 3.785 L
Step 1: Compute fuel for each segment
a) Start/Taxi/Take-off: 3.0 USG (given)
b) Planned route: 45 min = 0.75 hr → 0.75 × 9.5 = 7.125 USG
c) Approach/Landing: 3.0 USG (given)
d) Diversion: 17 min = 17/60 hr → 9.5 × 17/60 = 2.6917 USG
e) Reserve: 60 min = 1.0 hr → 1.0 × 9.5 = 9.5 USG
Step 2: Total required fuel
- 3 + 7.125 + 3 + 2.6917 + 9.5 = 25.3167 USG
Step 4: Uplift needed (in USG)
- 25.3167 − 16 = 9.3167 USG
Step 5: Convert to litres and round up operationally
- 9.3167 × 3.785 = 35.26 L ⇒ 36 L (round up)
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