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Determine the traffic load (TL) of a twin-engine piston aircraft, given:

Dry Operating Mass: 4 830 kg
Take-off Mass: 5 980 kg
Trip Fuel: 617 l
Take-off Fuel: 770 l
Specific gravity: 0.782020

  • A
    380 kg.
  • B
    533 kg.
  • C
    548 kg.
  • D
    668 kg.

Refer to figure.

First Step: Determine the Useful Load (UL)

The UL equals the sum of Traffic Load (TL) and the Take-off Fuel (TOF). Consequently, the useful load is the difference between the Take-off Mass and the Dry Operating Mass:

  • Useful Load = TOM - DOM
    Useful Load = 5 980 kg – 4 830 kg = 1 150 kg

Second Step: Determine Take-off fuel mass.
The conversion between fuel volume and mass is very simple: fuel volume in litres × Specific Gravity (density) = fuel mass in kg.
• 770 l × 0.782020 => 602 kg


Third Step: Determine the Traffic Load (TL)
The TL will be equal to the difference between the Useful Load (UL) and the Take-off Fuel (TOF).

  • Useful Load (UL) = TL + TOF
    Traffic Load (TL) = UL – TOF
  • Traffic Load (TL) = 1 150 kg – 602 kg = 548 kg

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