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A
The mass of all persons and items of load, including fuel and other consumable fluids.
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B
The mass of all passengers, crew and their baggage, less fuel and consumable fluids.
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C
The mass of crew, their baggage, plus removable units of equipment.
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D
The mass of passengers, crew and their baggage, plus removable equipment and consumable fuel and fluids.
The Variable Load (VL) consists of mass of the crew, their baggage and any removable equipment that is required for that flight, for instance catering and passenger service equipment, food and beverages, potable water and lavatory chemicals.
The Variable Load is often referred to as "Operational Items".
The Operator is responsible for determining the VL, which is calculated either with actual crew masses and their baggage or with standard masses. EU-OPS quotes 85 kg for flight crew and 75 kg for cabin crew, including their hand baggage, but the Operator may use other standard masses acceptable to the Authority.
The Operator adds the Variable Load to the Basic Empty Mass to establish the Dry Operating Mass (BEM + VL = DOM).
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