The Battelle G-1 has been operated as a Research Aircraft Facility at Pacific Northwest National Laboratory since 1991. The platform has provided steady support for the Department of Energy's (DOE) Atmospheric Science Program (ASP), the long-term goal of which is developing comprehensive understanding of the atmospheric processes that control the transport, transformation, and fate of energy related trace chemicals and particulate matter; the current focus of which is aerosol radiative forcing of climate: aerosol formation and evolution and aerosol properties that affect direct and indirect influences on climate and climate change. The platform is also available to non-DOE agencies (has flown for EPA, e.g.), and state and private entities, and now to NASA researchers through this Catalog. The aircraft’s 165 square feet of interior space is configured for maximum utility. Internal removable instrumentation racks and seats enable rapid reconfiguration as necessary. Inlets and sensors are mounted on aluminum inserts that replace selected windows. An onboard data acquisition system accommodates a wide range of analog and digital inputs. Instrumentation for measurement of state variables, including turbulent quantities, as well as navigation data are included in the base configuration.