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Refer to figure.
Actual Ground Speed (GS) on the leg waypoint 5 - 6 is 420 kt. Based on the planned and actual data shown in the flight log excerpt and provided that fuel consumption remains unchanged from previous leg, what remaining fuel should be expected at waypoint 6?
  • A
    7 012 kg
  • B
    188 kg
  • C
    7 200 kg
  • D
    7 030 kg
1) Calculate fuel consumption from WYPT 4 - WYPT 5:

Distance: 118 NM
GS: 471 kt

Fuel consumed = Fuel at WYPT 4 - Fuel at WYPT 5
Fuel consumed = 7.8 t - 7.2 t = 0.6 t
Flight time = (118 NM / 471 kt) x 60 min / h = 15 min
Fuel Flow (FF) = (0.6 t / 15 min) x 60 min / h = 2.4 t/h
2) Calculate fuel consumed between WYPT 5 - WYPT 6:

Flight time: 35 min

Distance WYPT 5 - WYPT 6: 33 NM
GS: 420 kt

Flight Time = (33 NM / 420 kt) x 60 min / h = 4.71 min
(2.4 t / h x 4.71 min) : 60 min / h = 0.188 t

3) Determine fuel remaining at WYPT 6:

Fuel at WYPT 5- Fuel consumed between WYPT 5 and WYPT 6
7.2 t - 0.188 t = 7.012 t = 7 012 kg

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