The engine is part of an Auxillary Power Unit (APU) NAVAIR 03-105BD-1, manufactured by Williams Research (now Williams International ) to start aircraft. The APU has all the components onboard to start, run, and continue running for the duration of time it is needed. These include a fuel control, lubrication system with reservoir tank and integral lubricant cooler, starting system, and electrical system. The starter is hydraulic, and would require a large "mule" (electric motor and hydraulic pump) to start the engine. A Mitsubishi car starter was attached to the engine so the hydraulic starter could be removed. Used at SRL shows for sound and flame effects.