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If you want to depart with maximum allowable take off fuel, determine the amount of extra fuel can you refuel, given:

Dry operating mass: 45 000 kg
Maximum structural take-off mass: 143 000 kg
Maximum performace limited take-off mass: 140 000 kg
Maximum zero fuel mass: 92 000 kg
Maximum structural landing mass: 95 000 kg
Trip fuel: 12 600 kg
Taxi fuel: 120 kg
Contingency fuel: 1400 kg
Alternate fuel: 3100 kg
Final reserve fuel: 3000 kg
Captains fuel: 3300 kg
Traffic load: 16 000 kg

  • A
    19 000 kg
  • B
    23 200 kg
  • C
    34 000 kg
  • D
    42 200 kg

The amount of extra fuel that can be uplifted is calculated by checking the limitations of PLTOM and MSLM as shown below.

Note: MZFM does not limit fuel.

To simplify our calculations below, let’s determine the Take-off Fuel (TOF) and the Actual Take-off Mass (ATOM):

TOF = Trip Fuel + Contingency Fuel + Alternate Fuel + Final Reserve Fuel + Captain’s Fuel
TOF = 12 600 kg + 1400 kg + 3100 kg + 3000 kg + 3300 kg = 23 400 kg

ATOM = DOM + Traffic Load + TOF
ATOM = 45 000 kg + 16 000 kg + 23 400 kg = 84 400 kg

Based on Maximum Performance Limited Take-off Mass (PLTOM):

PLTOM – ATOM = 140 000 kg – 84 400 kg = 55 600 kg

Based on Maximum Structural Landing Mass(MSLM):

MSLM – Landing mass (LM)* = 95 000 kg – 71 800 kg = 23 200 kg

*LM = ATOM - Trip fuel = 84 400 kg – 12 600 kg = 71 800 kg

=> The most restricting value in based on MSLM: 23 200 kg

Note: don't forget that the taxi fuel is not part of the take-off fuel! The take-off fuel is the fuel contained at the beginning of the take-off (on the runway). At this location, taxi fuel has already been burned off.

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