unnecessarily, as this type of cushioning material deteriorates rapidly when exposed to air. REMOVING HOSE OR HOSE ASSEMBLIES Hose or hose assembly removal procedures must include contamination control procedures as well as actual removal procedures to prevent contamination to the opened system. Contamination Control Procedures Perform contamination control procedures before removing any hose or hose assemblies. You should use approved solvents and clean, lint-free cloths to clean the affected area and wipe down fittings to remove excessive contaminants. Use a suitable container to catch spilled fluid. Have replacement hose, hose assemblies, or protective closures on hand for installation when you disconnect hose or hose assemblies. If hose replacement is not practical, cap or plug hose or hose assembly ends immediately after disconnecting. Removal Procedures Once contamination control has been accom- plished, you can begin removal of hose and hose assemblies. Remove all supporting clamps from hose or hose assembly. Remove lockwire (if present) from swivel nuts. Turn swivel nuts only to disconnect hose assembly. Loosen nuts carefully to avoid damage. Disconnect the hose assembly by using two open-end wrenches. One is to grip and prevent turning of the fitting to which the hose assembly is connected, and the other is to loosen the swivel nut. Hose and hose assemblies (particularly Teflon®) have a tendency to become set to shape in service. Some Teflon® hose assemblies are deliberately preformed during the fabrication process. Do not attempt to straighten a preformed hose. Protect the preformed areas from distortion by a restrainer. The restrainer may be of wire, metal, plastic forms, or any other suitable device to retain the preformed configuration. Install the protective closures to seal open parts of hydraulic lines and ends of removed hose or hose assemblies. INSTALLING HOSE OR HOSE ASSEMBLIES When you install hose or hose assemblies, it is important that you follow certain practices or procedures to prevent premature failure of hose or hose assembly or possible injury. Before you begin actual installation procedures, there are guidelines you should remember about installing hose or hose assemblies. The replacement hose or hose assembly must be a duplicate of the one removed in length, outside diameter, material, type, contour, and associated markings. Only fluid conforming to MIL-H-5606, MIL-H-83282, or MIL-H-81019 is to be used on hydraulic or pneumatic hose installations. Do not use oil of any type on self-sealing hose as an aid to installation. Compatible oil, approved for the purpose, may be used on all other types of fuel, oil, and coolant hose installations. When you install or handle hose or hose assemblies, you can sustain injuries to your hands or damage to the hose if it is kinked. You should take care to prevent situations where injuries or kinking can occur. A hose that is bent to a smaller radius than specified might cause kinking. See table 5-8. A preformed hose assembly, or one that has become set-to-shape of its operating position, is straightened or handled without a protective restraint. A hose or hose assembly that is twisted during handling, removal, or installation can easily cause kinking. Preinstallation Procedures Check hose or hose assembly before installing it to make sure that identification bands and protective closures are present as required after proof pressure testing. Inspect hose for proper type and size, and for aging (signs of deterioration such as cracks, dis- coloration, hardening, weather checking, or fungus). Check the braid for two or more broken wires per plait, or more than six broken wires per linear foot. Inspect for broken wires where kinking is suspected. Evidence of internal restriction of tube due to collapse, kinking, wire-braid puncture, or other damage can be found by using one of the following methods of inspection:    For straight hose assembly, insert a light at one end and visually inspect from the opposite end. For elbow fitting on both ends (practical for larger sizes only), insert flexible 5-24