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(For this question use annex 033-043 and 033-055 rev. 05.11.2004).
The flight crew of a turbojet aeroplane prepares a flight using the following data:

Distance of Flight: 3 500 NM
Flight level FL 310, true airspeed: 450 kt
Headwind component at this level: 55 kt
Initially planned take-off mass (without extra fuel on board): 180 000 kg
Fuel price at destination: 0.27 $/l
The commander may carry on board 8 000 kg more fuel than that which is necessary.

For this fuel transport operation to be cost effective, the maximum fuel price at departure must be:

  • A
    0.24 $/l
  • B
    0.29 $/l
  • C
    0.30 $/l
  • D
    0.28 $/l

NAM = NGM x TAS ÷ GS = 3 500 x 450 ÷ 395 => 3 987 NAM.

We enter the chart at the bottom scale at a value of 188 000 kg (180 000 kg + additional 8 000 kg of fuel) see on the chart and finally we found fuel price ratio of 0.9.

This is the ratio of "Departure fuel price ÷ Destination fuel price " so ; x ÷ 0.27 = 0.9

0.90 * 0.27 =0.24 $ / l

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