12 / 20

Given the following planning data, calculate the maximum possible extra fuel in kg, including any fuel penalty that can be uplifted:

Maximum Ramp Mass: 77,500kg
Maximum Take Off Mass: 77,000kg
Maximum Landing Mass: 66,360kg
Maximum Zero Fuel Mass: 62,720kg
Dry Operating Mass: 42,845kg
Traffic Load: 17460kg
Planned Take Off Fuel: 10365kg
Trip Fuel: 7890kg
Taxi Fuel: 195kg
Fuel Penalty: 135kg/1000kg of extra fuel
Max Fuel Tank Capacity: 14,000kg

  • A
    4139 kg
  • B
    3580 kg
  • C
    3440 kg
  • D
    6635 kg
In order to find out the amount of fuel which can be uplifted you have to calculate the MTOM, MLM and tank capacity limitation - the most limiting value obtained from these calculations will be the maximum fuel which can be uplifted.
Note: MZFM does not limit fuel.
BASED ON MAXIMUM TAKE OFF MASS (MTOM):
  • MTOM – (ATOM) = 77 000kg - 70 670 kg = 6 330 kg
  • Actual Take off mass ATOM = Dry Operating Mass (DOM) + Traffic load (TL) + Take Off fuel (TOF) = 42 845 kg + 17 460 kg + 10 365 kg = 70 670 kg
*Clearly MRM is not a limiting factor too as taxi fuel is only 195 kg and MTOM + 195 kg is more limiting than MRM.
BASED ON MAXIMUM LANDING MASS MLM:
  • MLM – Landing mass = 66 360 kg - 62 780 kg = 3580 kg
  • LM = ATOM - Trip fuel = 70 670 kg - 7 890kg = 62 780 kg
  • On top of this calculation, for the MLM limitation we have to apply the fuel penalty - which will be burned off during the flight
Rule of thumb: to calculate fuel penalty, use the following formula:
(MLM extra / 1000) x Y
- where "Y" is the variable given by the question, in this case = 135

( 3580/1000) x 135 = 483.3 kg

Extra fuel that can be loaded is the sum of MLM extra (3580 kg) and fuel penalty:
3580 kg + 483.3 kg = 4 063.3 kg


BASED ON FUEL TANK CAPACITY:
Maximum Tank Capacity - (Take off fuel + Taxi fuel)
14 000 kg - (10 365kg + 195 kg) = 3440 kg
=> The most restricting value in based on Fuel Tank Capacity: 3440 kg

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.

  • Czech Republic
  • Portugal
  • United Kingdom