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Use the following information to determine the increase in fuel required for a cruise leg for a Medium-Range Jet Transport (MRJT) flight.

Cruise leg distance: 135 NM
Planned cruise TAS: 450 kt
Forecast wind component: +25 kt
Planned cruise fuel consumption: 5 kg/NAM
Revised forecast wind component: -25 kt

  • A
    0 kg
  • B
    250 kg
  • C
    50 kg
  • D
    75 kg

Planned GS = TAS + Forecast Wind Component = 450 + 25 = 475 kts
Air Distance = Ground distance x TAS / GS = 135 x 450 / 475 = 128 NAM
Planned fuel = 128 x 5 = 640 kg

Wind Component changed:
New GS = 450 - 25 = 425 kts
New Air Distance = Ground distance x TAS / GS = 135 x 450 / 425 = 143 NAM
New fuel required = 143 x 5 = 715 kg

Fuel difference = 715 - 640 = 75 kg

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