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Refer to AMSTERDAM - Chart 10-2B from Jeppesen GSPRM 2017.
You are flying from the waypoint MOLIX to SUGOL, with 330 kt TAS, 180°/25 kt wind, fuel flow 1 800 kg/h. Your actual fuel over MOLIX is 3 000 kg. ATC asks you to hold over SUGOL for 20 minutes. What is your fuel remaining after the holding?
  • A
    2 190 kg
  • B
    2 220 kg
  • C
    2 400 kg
  • D
    2 790 kg
Few considerations:
- We must know the fuel we will have onboard over SOGUL, before we start holding => We must know the amount of fuel consumed from MOLIX to SOGUL.
- In order to calculate fuel consumption between MOLIX - SOGUL, we must know our Ground Speeds - these will be affected by the wind and change in track.
- Track and distance information can be taken from the graph.

(1) Let's start by calculating the Ground Speed and flight time for the two legs: MOLIX - ROBVI and ROBVI - SOGUL: Ground Speed can be calculated using the Flight computer.
  • MOLIX - ROBVI: Track 120º, 30 NM (17 NM + 13 NM), TAS 330 kt => GS = 317 kt
    Flight time = 30 NM / 317 kt = 5.7 min
  • ROBVI - SOGUL: Track 114º, 7.5 NM, TAS 330 kt => GS = 319 kt

    Flight time = 7.5 NM / 319 kt = 1.4 min

=> Total flight time = 5.7 min + 1.4 min = approx. 7 min


(2) Calculate Fuel consumed between MOLIX - SOGUL:
Fuel Flow: 1 800 kg/h
Flight Time: 7 min

Fuel consumed = 7 min x 1 800 kg/h = 210 kg
(3) Calculate holding fuel:
Fuel Flow: 1 800 kg/h
Holding: 20 min

Fuel consumed = 20 min x 1 800 kg/h = 600 kg
(4) Calculate Total Fuel Consumed:
Fuel consumed MOLIX - SOGUL + Holding fuel = 210 kg + 600 kg = 810 kg
(5) Calculate Fuel Remaining after holding:
Fuel over MOLIX - Total Fuel consumed = 3 000 kg - 810 kg = 2 190 kg

Your Notes (not visible to others)



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