This Aerospace Standard (AS) defines the requirements for a heavy braid polytetrafluoroethylene (PTFE) lined@ metallic reinforced@ hose assembly suitable for use in high temperature@ 400 ?? high pressure@ 3000 psi@ aircraft hydraulic fluid systems@ also for use in pneumatic systems which allow some gaseous diffusion through the PTFE wall. The -20 size operating temperature is limited to 275 ??maximum.