An aircraft flies from A to B with 27 USG of fuel on board. The trip fuel is 14 USG, and the alternate and reserve fuel are 9 USG. If the holding fuel flow is 6.5 USG/hr, for how long can the aircraft hold over B without using the reserve fuel?
Find the fuel over aerodrome B
The aircraft had 27 USG of fuel on board. Over aerodrome B, it would have:
- Fuel over B (USG) = Fuel on board (USG) - Trip Fuel (USG)
- Fuel over B = 27 USG - 14 USG
- Fuel over B = 13 USG
Calculate the holding time
The holding time (excluding reserve fuel) can be calculated by dividing the fuel over aerodrome B (excluding reserve fuel) by the holding fuel flow.
- Fuel over B (excluding reserve) = Fuel over B - reserve fuel
- Fuel over B (excluding reserve) = 13 USG - 9 USG
- Fuel over B (excluding reserve) = 4 USG
Therefore,
- Holding time (hours) = Fuel over B (excluding reserve) / holding fuel flow (USG/hr)
- Holding time = 4 USG / 6.5
- Holding time = 0.61 hr
Convert the holding time to minutes
- Holding time (minutes) = Holding time (hours) x 60
- Holding time = 0.61 hr x 60
- Holding time = 36.9 ~ 37 min
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