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The Take-off Mass of a helicopter is 6 700 kg, which includes a traffic load of 2 200 kg and a usable fuel load of 2 500 kg. If the mass of the crew is 165 kg, the Dry Operating Mass is...
  • A
    2 000 kg
  • B
    4 500 kg
  • C
    4 200 kg
  • D
    1 835 kg

Refer to figure.
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) consists of the fuel onboard for a flight and traffic load.

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 fuel.

Calculate DOM by:

  • DOM = TOM – TL – Usable Fuel = 6 700 kg – 2 200 kg – 2 500 kg
  • DOM = 2 000 kg

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