Harlow Aerostructures and Verocel (software testing facility) have Completed DO-178 testing for an auto throttle system designed for general aviation aircraft. Harlow, based in Wichita, designed the HAT-05 auto throttle’s hardware and software for use by twin-engine, advanced aircraft with full-authority electronic digital controls (FADEC) in new or retrofit applications, it said. Verocel, based in Westford, Massachusetts, partnered with Harlow to help with software certification.