1.1 Application:This SAE Aerospace Standard (AS) defines the requirements for a convolutedpolytetrafluoroethylene (PTFE) lined, metallic reinforced, hose assembly suitable for use inaerospace fluid systems at temperatures between -65 °F and 400 °F for Class 1 assembly, -65 °Fand 275 °F for Class 2 assembly, and at operating pressures per Table 1. The use of these hose assemblies in pneumatic storage systems is not recommended. In addition, installations in which the limits specified herein are exceeded, or in which the application is not covered specifically by this standard, shall be subject to the approval of the procuring activity.1.2 Classification:1.2.1 Hose assemblies furnished under this document shall be of the following classes:a. Class 1 - All corrosion resistant steel fittings, -65 to 400 °Fb. Class 2 - Combination aluminum alloy nut, flange, nipple, elbow and corrosion resistant steelsocket fittings, or all aluminum fittings, -65 to 275 °F1.2.2 Hose assemblies furnished under this document shall be of the following types:a. Type I - Conductive PTFE Innertubeb. Type II - Non-Conductive PTFE Innertube