other approved closures. You can use clean, polyethylene bags if you do not have the approved metal closures, providing the bags are adequately secured and are protected from physical damage and the entrance of water. When equipment is not being used, store it in clean, dry areas. Minimize exposure of in-service equipment to precipitation, wind-driven sand, or other environmental contaminants. Operational Use Operate test stands equipped with hydraulic manifolds for self-recirculation cleaning before they are connected to equipment or components under test. Recirculation clean the test stand for a sufficient period of time to let a minimum of one pass of its total reservoir contents through the internal filtration. Closely monitor differential pressure of loaded filter indicators during all SE operations after the fluid reaches normal operating temperature (+85°F minimum). Equipment operation is terminated immediately upon appearance of loaded filter indications. Replace the loaded element. You should stop using the SE if the reservoir or outlet fluid is, or is suspected to be, unacceptably contaminated. Inform the supporting maintenance activity immediately so that required remedial action can be taken. Periodic Maintenance Supporting activities for hydraulic SE perform periodic maintenance at prescribed intervals, unless otherwise directed. At this time, samples are taken from all hydraulic SE reservoirs (preferably at a low point drain) and analyzed for particulate level and water content. If the fluid is unacceptable, it is recirculation cleaned, purified, flushed, or purged. Hydraulic filter elements that can be cleaned are ultrasonically cleaned or replaced at the prescribed maintenance interval. Because of their large dirt-holding capacity, disposable 3-micron pressure line filters are replaced only upon actuation of their differential pressure indicators. Disposable filters that do not have differential pressure indicators are replaced at the prescribed interval. Age-controlled, deteriorative hoses used to carry hydraulic fluid in SE units are not to remain in service for more than 7 years beyond the manufacturer’s cure date. Additionally, hoses of this type that are internally located in the equipment are replaced at each prescribed major rework interval, not to exceed 4 years. The date of the required removal and serial number of the equipment is etched or peened on the hose collar. Replace external deteriorative hoses used to transfer fluid between SE and aircraft or components under test that cannot be positively identified as having been in use for less than 2 years as soon as possible, and at regular intervals thereafter, not to exceed 2 years. The date of required replacement and the SE serial number is etched or peened on the hose collars. Hoses should remain attached to the equipment until replacement is required. Upon completion of periodic maintenance, hydraulic SE is certified as having a fluid contamination level not in excess of Navy Standard Class 3. FLUID SAMPLING, ANALYSIS, AND DECONTAMINATION Fluid sampling points and procedures vary with the SE type and model. For specific procedures applicable to the particular equipment, you should refer to NAVAIR 01-1A-17. Run the SE for a minimum of 5 minutes before you take a sample. This results in fluid flow through SE reservoirs, which ensures a uniform distribution of contaminants. On some SE models, you need to return the pressure outlet to the reservoir fill opening to achieve such a flow. Find and gain access to the reservoir drain valve and other sampling points or adapters. You need to remove dirt and other visible contaminants from the exposed part of the drain valve and/or sampling adapter. When taking a sample for a patch or particle patch test, wipe the valve or adapter with a clean, disposable cloth. Then, use the plastic wash bottle in the Contamination Analysis Kit 571414 to flush the fittings with clean trichlorotrifluoroethane solvent (MIL-C-81302), 1,1,1-trichloroethane solvent (MIL-T-81533), or dry-cleaning solvent (P-D-680). When you have finished flushing the fittings, open the reservoir drain valve and allow approximately 1 quart of fluid to drain into a waste receptacle. Without interrupting the flow of fluid, take the required sample by letting an additional 4 ounces of fluid flow into a known clean sample bottle (provided with the contamination analysis kit). Close the drain valve after you remove the sample bottle from the fluid stream. Label the bottle to indicate where you took the sample. Repeat the sample-taking procedure at other specified or available sampling points, collecting each sample in a separate bottle. Visually inspect the fluid collected in the waste 4-39