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Refer to figure.
A crew is directed by Operations to tanker fuel at the departure aerodrome due to difficulties with the fuel supply at the destination aerodrome B.

Given the data below, what is the optimum quantity of fuel that should be tankered?

Fuel price at departure aerodrome: 0.77 $
Fuel price at destination: 0.87 $
Air distance: 1500 NM
Planned Take-off mass without tankering: 51 000 kg
Cruising level: FL330
Planned cruise speed: M0.74
Maximum TOM: 62 800 kg

  • A

    2500 kg

  • B

    0 kg

  • C

    11 800 kg

  • D

    6800 kg

Refer to figure.
The Fuel Price Ratio is calculated as the Departure Fuel Price divided by the Destination Fuel Price. For instance, if the Departure Fuel Price is 0.77 and the Destination Fuel Price is 0.87:

Fuel Price Ratio = 0.77 / 0.87 = 0.885

To find the Optimum Take-off Mass corresponding to this Fuel Price Ratio, you can refer to the graph.

  • Start by locating the point at 0.885 on the graph, then move horizontally to the 1500 NM line, and finally move downward to read the Optimum Take-off Mass, which is 53 500 kg.

The Tankering, which represents the difference between the Optimum Take-off Mass and the planned Take-off Mass, can be calculated as:

Tankering = Optimum Take-off Mass - planned Take-off Mass
Tankering = 53 500 kg - 51 000 kg = 2500 kg

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