Electric equipment covered by this standard are intended for use on military aircraft as components of the electric power generation and distribution system. These do not include engines, auxiliary power units, or gearboxes that drive generators, but do include the generator systems mounted thereon. A constant speed drive is considered to be a part of an ac generating system. The electric power distribution system extends up to the input terminals of the electric power utilization equipment, but does not include the electric power utilization equipment. However, motors larger than 0.5 horsepower have been included as electric equipment because of their significant impact on the performance of the electric power system.