NASA C-23 Sherpa Research Aircraft (IMAGE) NASA/Goddard Space Flight Center Caption The Wallops Flight Facility Aircraft Office operates the NASA C-23 Sherpa research aircraft available to support airborne science research. The C-23 is a two-engine turboprop aircraft designed to operate under the most arduous conditions, in a wide range of mission configurations. Credit NASA Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.