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The ACU-303 is a mobile, Diesel-Electric, air conditioning unit designed to cool or, when equipped, heat an aircraft to obtain the adequate temperature in the cockpit and cabin during pre-flight operations, boarding and maintenance. It has sufficient cooling power for narrow body aircraft and meets the needs and requirements of civil aircraft in continental, tropical or desert climates. The ACU-303 is built with top-of-the-line material, resulting in extremely low maintenance requirements during its lifetime. The main features of this unit are high efficiency, smart equipment, compactness, and simplicity.