Keystone Turbine Services (KTS) is a certificated FAA Part 145 Repair Station located in Coatesville, PA, with a legacy dating back to 1976. The company specializes in the maintenance, repair, and overhaul of Rolls-Royce M250 engines and Honeywell related accessory lines, offering functional and full-performance engine testing for turboshaft and turboprop engines. KTS also provides engine, module, accessory, and component sales, exchanges, lease or rental units, spare parts sales, and global field service support.
FAA Part 145 Repair Station
Rolls-Royce M250 Series Authorized Maintenance, Repair & Overhaul Center (AMROC)
Honeywell Authorized Warranty & Repair Station (AWARS)
ROLLSROYCEM250AMROC
Quality certification
HONEYWELLAWARS
Quality certification
Turbine Standard LtdFounded in Ohio in 2004, Turbine Standard is an independent aviation repair station known for the depth of experience among its people, who bring more than 500 years of combined turboprop engine repair knowledge. From facilities in Ohio and Florida, the company supports aircraft operators worldwide with specialized maintenance for turboprop engines.HOLLAND, OH
Aero Propulsion Support, IncAero Propulsion Support repairs small gas turbine engines and components for auxiliary power and propulsion applications, serving civilian and military customers from its 25,000-square-foot facility in Harrison, Ohio. The company combines repair support with distribution of turbine parts and manufacturing of prototype OEM components, and reports 31 years of experience, 50 business partners, and products installed in 25 countries. Its repair station holds FAA, EASA, and UKCAA approvals and supports work for customers including Rolls-Royce and Wright-Patterson Air Force Base.HARRISON, OH
Rotating Machinery Services, Inc. (RMS)Founded in 1998, Rotating Machinery Services (RMS) repairs, overhauls, maintains and supplies OEM equipment for large, highly engineered turbomachinery. Headquartered in Bethlehem, Pennsylvania, the company combines independent engineering with vertically integrated manufacturing, including a 150,000-plus-square-foot flagship service center on the Houston Ship Channel and the specialized TurboCare network added in 2025. RMS serves customers worldwide and holds ISO 9001:2015 certification at key Bethlehem, Appleton and Houston locations.CANASTOTA, NY
Royal AircraftEstablished in 2005 at Hagerstown Regional Airport, Royal Aircraft is an FAA-certified repair station specializing in maintenance, structural repair, and custom paint for turboprop and piston aircraft under 12,500 pounds. Its family-style operation puts customers in direct contact with the technicians, while a leadership team with 75 years of combined aviation experience handles everything from routine inspections to complex damage repairs and refinishing. Royal serves aircraft owners, flight schools, and Part 135 operators throughout the Mid-Atlantic.HAGERSTOWN, MD