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Refer to figure. 
Given:

Planned and actual data as shown in the Flight Log extract. Provided that flight conditions on the leg GAMMA to DELTA remain unchanged and fuel consumption remains unchanged, what fuel remaining should be expected at waypoint DELTA?

  • A

    3920 kg

  • B

    4590 kg

  • C

    4460 kg

  • D

    4370 kg

First Step: Calculate the actual fuel consumption BETA - GAMMA

  • Fuel consumed BETA - GAMMA = Actual Fuel remaining at BETA - Actual Fuel Remaining at GAMMA
  • 5290 kg – 5040 kg = 250 kg
  • Time BETA – GAMMA = 2:23 – 1:58 = 25 min
  • Fuel Consumption = 250 / 25 = 10 kg/min

Second Step: Calculate fuel consumed GAMMA - DELTA 
Note: Provided that the flight conditions will not change, the ATA over DELTA will be equal to ETA => 3:08. 
TIME GAMMA - DELTA = 3:08 - 2:23 = 45 min 
Fuel consumed: 45 min x 10 kg/min = 450 kg

Third Step: Calculate Fuel remaining at DELTA 
FUEL at DELTA = Actual Fuel over GAMMA - Fuel Consumed (GAMMA - DELTA) 
FUEL at DELTA = 5040 kg – 450 kg = 4590 kg

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