A fixed wing flight vehicle has wing, a center-mounted propulsion unit and a pod that is moveable between a center of the wing and a displaced position at or near one end of the wing. The present invention is a method for producing a catalyst containing molybdenum, bismuth, and iron, which contains the steps of washing a surface of at least one device equipped in an apparatus for the production of catalyst, to which a solid matter adheres, with a basic solution, and producing the catalyst with the apparatus for the production of catalyst thus washed. During use, the media path extends between the printhead assembly and at least some of the service modules configured to operate in one of the modes while any of the service modules beyond the media path operate in another of the modes. The retaining pieces retain the tray at a tray level when the swing arms are in the closed position, and release the tray and are disposed entirely below the tray level when the swing arms are in the open position. The device is easily installed as an add-on device on both new and existing truck bodies. Components include multiple, discrete features that extend laterally from a common side of an upper end of a formation, for engagement of loops.