The GTCP331, a 600 HP Auxiliary Power Unit Program

The Garrett GTCP331 series auxiliary power unit (APU) is currently entering airline service as a Category I -Essential APU with the Boeing and Airbus advanced transport aircraft. The GTCP331 APU serves as a secondary pneumatic and electrical power source for the aircraft systems, both on the ground and in-flight. As it enters airline service, the GTCP331 APU offers: sound design origin, advanced metallurgical technology, a rigorous test program background, state-of-the-art full authority digital electronic controls, and the application of acoustic attenuating techniques and materials. These facets combine to present user-airlines with a modern, high-technology APU that through lowered operating cost, and increased reliability and maintainability, meets the challenge of reduced cost of ownership.