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The mission segment fuel fraction method computes fuel by

  • A.Dividing total range by specific fuel consumption
  • B.Assuming a fixed fraction of take-off weight
  • C.Weighing the fuel before flight
  • D.Multiplying weight ratios for each phase of the mission

Answer: D

Each segment has a characteristic ratio of end weight to start weight, historical for short phases and computed by Breguet for cruise and loiter. Multiplying them through gives the overall ratio and hence the fuel required.

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