Lightweight hose assemblies used as flexible connections on medium pressure airframe applications where flexibility, weight, and fire resistance are important. Lightweight hose assembly is used for applications with operating pressures up to 1000 psi (6.9 MPa). The items covered by this specification are hose assemblies used in military aircraft lubricating and fuel systems requiring interoperability and compatibility with associated components and equipment. These systems are required to withstand temperatures between -65°F to +250°F (-54°C to +121°C). Not recommended for hydraulic impulse applications or vacuum without internal support spring. The first article process ensures the hose assemblies will meet the proof pressure and burst pressure requirements.