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The following planning data are given for a Commercial Air Transport flight. Determine the underload of this flight:

Maximum Take-Off Mass: 62 800 kg
Performance-Limited Take-off Mass at departure: 61 600 kg
Dry Operating Mass: 34 550 kg
Block Fuel: 10 970 kg
Taxi Fuel: 130 kg
Trip Fuel: 6150 kg
Reserve Fuel (contingency, alternate and final): 2430 kg
Passengers and baggage mass: 10 220 kg
Freight mass: 2480 kg

  • A

    3510 kg

  • B

    4710 kg

  • C

    5770 kg

  • D

    5990 kg

Underload. The difference between allowable load and current load (under-load = allowable traffic load - actual traffic load). This load can be added due to last-minute changes.
Underload = Allowed take-off mass - Operating Mass (OM) - Traffic Load (TL)

Operating Mass (OM): It is the DOM plus take-off fuel but without traffic load.
OM = DOM + TOF
OM = 34 550 kg + (10 970 kg - 130 kg) = 45 390 kg

Traffic Load (TL): It is the total mass of passengers, their baggage, cargo and any non-revenue load.
TL = 10 220 kg + 2480 kg = 12 700 kg

Underload = 61 600 kg - 45 390 kg - 12 700 kg = 3510 kg

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