Basic Empty Weight
The starting point for weight computations is the basic
empty weight, which is the weight of the standard helicopter,
optional equipment, unusable fuel, and all operating fluids
including engine and transmission oil, and hydraulic fluid
for those aircraft so equipped. Some helicopters might use
the term “licensed empty weight,” which is nearly the same
as basic empty weight, except that it does not include full
engine and transmission oil, just undrainable oil. If flying a
helicopter that lists a licensed empty weight, be sure to add
the weight of the oil to computations.