1. First check the Maximum Take Off Mass.
Select the lowest of Maximum Take-Off Mass (MTOM) and Maximum Landing Mass + Trip Fuel

• MTOM = 64 400 kg
• Maximum Landing Mass + Trip Fuel = 56 200 kg + 4900 kg = 61 100 kg (lowest)

We want to find the amount of extra fuel we can carry on top of the minimum take off fuel:

2. Find your Actual Take Off Mass (ATOM) by adding up the Dry Operating Mass (DOM), Traffic Load and minimum take off fuel.

ATOM = 35 500 (DOM) + 14 500 (Load) + 7400 (min TOF) = 57 400 kg

3. Subtract 57 400 kg from the MTOM calculated in Step 1 to get the underload
61 100 kg – 57 400 kg = 3700 kg of Extra Fuel that can be carried

The maximum allowable take-off fuel equals the minimum take off fuel plus the extra fuel which can be carried

• 7400 kg + 3700 kg = 11 100 kg

Note: MZFM does not limit fuel load. The MZFM is a structural limit based on the bending moments of the wing root.