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Heli-Support, Inc. (HSI), a subsidiary of Roberts Aircraft Company, is an American Eurocopter approved dynamic component overhaul facility (D-Level Maintenance) for the Alouette, Lama and AS-350/355 series aircraft. Additionally, HSI operates a fleet of over 50 helicopters. HSI is a one stop Eurocopter airframe and Turbomeca powerplant service center. Turbomeca Engine Corporation has authorized HSI as a deep maintenance and complete overhaul facility for the Arriel and Artouste III B engines. HSI is the only facility in North America so authorized. In addition to its locations in the United States, HSI has a new facility in Gothenburg, Sweden. Heli-Support Inc.'s facility in Casa Grande, Arizona, is a Designated Alteration Station (DAS) offering FAA Supplemental Type Certificates (STC) for certain alterations on the SE3180 series, SA315B Lama, SA316B series, AS350, AS355, and the Boeing 369 series. Other helicopters may be added to its certification upon request. HSI also offers a number of alterations and parts including skid tubes, snow skis, barrier air filters, fairing assemblies, extended step and cargo mirrors, pilot support, and collective extension devices.