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Given the following information, calculate the useful load.

Basic Empty Mass: 5 200 kg
Operational items (including crew): 270 kg
Take Off Mass: 7 840 kg (including a usable fuel quantity of 1220 kg)

  • A
    2 370 kg
  • B
    1 150 kg
  • C
    1 490 kg
  • D
    2 640 kg

Refer to figures.
Dry Operating Mass (DOM) is the total mass of the helicopter ready for a specific type of operation excluding all usable fuel and traffic load. This mass includes the items below, known as Variable Load (VL):

  • Crew and crew baggage
  • Catering and removable passenger service equipment
  • Portable water and lavatory chemicals
  • Food and beverages.

Take-Off Mass (TOM) is the mass of a helicopter including everything and everyone contained within it at the start of the take-off run.

Useful Load (UL) the total mass of passengers, baggage and cargo, including any non-revenue load and usable fuel.

Traffic load (TL) in a helicopter refers to the number of passengers or cargo that the aircraft is carrying at a given time. It is used to determine the weight and balance of the helicopter, which is important for safe flight. The maximum traffic load of a helicopter is determined by its design and is specified in its flight manual.

Zero Fuel Mass (ZFM) is the term used to describe the DOM plus TL but excluding usable fuel.

Given the below formulas:

  • UL = TL + usable fuel
  • TOM = DOM + TL + usable fuel
  • DOM = BEM + Operational Items

Therefore, we can derive:

  • UL = TOM – BEM – Operational Items
  • UL = 7 840 kg – 5 200 kg – 270 kg = 2 370 kg.

NOTE:
The usable fuel has been given just to distract you because TOM includes usable fuel by definition.

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