When computing weight and balance, the basic empty weight includes all of the following except:

In the context of weight and balance calculations, the basic empty weight of an aircraft is crucial for ensuring safe flight operations. Basic empty weight typically includes everything that is part of the aircraft structure except for any payload and usable fuel.

The components that are considered as part of the basic empty weight generally include the weight of the airframe, the engine(s), all installed optional equipment, as well as unusable fuel and oil. Importantly, usable fuel and oil are not included in the calculation of basic empty weight because they are variable and depend on the flight, impacting the overall weight as fuel is consumed.

Specifically, radio equipment and other optional equipment are included in the basic empty weight because they are permanently installed and contribute to the aircraft's weight before any payload or fuel is added.

Thus, the correct answer identifies that usable fuel and oil are excluded from the basic empty weight calculation, making it clear that basic empty weight comprises the static components of the aircraft that contribute to its structural integrity and function without considering the additional variable weights associated with operation.