Temporary Ballast. Weights that can be carried in a cargo compartment of an aircraft to move the location of CG for a specific flight condition. Temporary ballast must be removed when the aircraft is weighed.
Basic Empty Weight. (GAMA) Standard empty weight plus optional equipment.
Basic Operating Index. The moment of the airplane at its basic operating weight divided by the appropriate reduction factor.
Basic Operating Weight (BOW). The empty weight of the aircraft plus the weight of the required crew, their baggage and other standard item such as meals and potable water.
Bilge Area. The lowest part of an aircraft structure in which water and contaminants collect.