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Auxiliary Power Unit:

The Small Engine and Accessories Test Area (SEATA) facilitates test aircraft starting and auxiliary power systems, small engines and accessories. The SEATA consists of six test rooms which contain mounting provisions for at least two concurrent test setups and a supply of high-pressure/high-temperature compressed air, hydraulic and electrical power and cooling water for heat and power absorption. Each room has its own dedicated control room which supports remote operation, control devices…

An auxiliary power unit (APU) is a device on a vehicle that provides energy for functions other than propulsion. which is mainly used in large aircraft and naval ships.