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In contrast to the sensory inspection conventionally performed on the firing bench during final assembly, a technology in which quality inspections are distributed throughout the engine assembly line by using an electric motor to drive the engine, has been developed. Through this process, combustion conditions can be quantitatively tested by component, and leak test conditions can be optimized. Consequently, defects can be detected and their causes identified at an early stage of assembly, thus accelerating the feedback of information to the appropriate process. The result, a level of product quality that is higher than through the conventional means.