An aircraft flies from A to B distance with a total distance of 135 NM at a groundspeed of 90 kt and a fuel flow 8 USG/hr. If the total fuel on board is 18 USG, what is the reserve fuel?
Find the trip time
Using formula:
- Time (hr) = distance (NM) / groundspeed (kt)
- Time = 135 NM / 90 kt
- Time = 1.5 hr
Find the trip fuel
To find the trip fuel, we can simply multiply the time by our fuel flow.
- Trip Fuel (USG) = time (hr) x fuel flow (USG/hr)
- Trip Fuel = 1.5 hr x 8 USG/hr
- Trip Fuel = 12 USG
Find the reserve fuel
The reserve fuel can be calculated by subtracting trip fuel from the total (block) fuel.
- Reserve fuel (USG) = Total fuel (USG) - trip fuel (USG)
- Reserve fuel = 18 USG - 12 USG
- Reserve fuel = 6 USG
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