August 26, 201114 yr BASIC EMPTY MASS + OPERATIONAL ITEMS = DRY OPERATING MASS (DOM)DRY OPERATING MASS + PAYLOAD = ZERO FUEL MASS (ZFM)ZERO FUEL MASS + TAKE OFF FUEL = ACTUAL TAKE OFF MASS (ATOM)ACTUAL TAKE OFF MASS + TAXI FUEL = ACTUAL RAMP MASS (ARM) *Basic empty mass contains unusable fuel and undrainable fluids, the racasan from the toilets, emergency equipment, first aid equipment, galley equipment, engine oils and hydraulic fluid (skydrol) *Operational items are considered to be the crew, cutlery, dry stores, drinks, duty free, food, spare parts carried on board... *I don't like calling them weights, because they are not weights, they are masses. Weight is measured in newton. Omar Josef 737/757/767
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