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CONTAMINATION CONTROL The direct connection between hydraulic SE and the systems or components being checked or serviced is necessary to minimize the introduction of external contaminants. Test units that are not properly configured, maintained, or used may severely contaminate hydraulic systems in operational aircraft. It is your responsibility to make sure that hydraulic SE is maintained and used according to existing contamination controI requirements. Configuration SE used to service or test aircraft hydraulic systems or components are equipped with adequate output filtration having a rating of 3-microns (absolute). The 3-micron filter assembly is a nonbypass variety, preferably equipped with a differential pressure indicator. It is installed immediately upstream of the major fluid discharge ports. Portable hydraulic test stands are equipped with recirculation cleaning manifolds and fluid sample valves for self-cleaning and fluid analysis before they are connected to equipment under test. Cleanliness Hydraulic SE is maintained in a clean state. All hydraulic SE is maintained as clean as practicable, consistent with its construction and use. Always keep external fluid connections, fittings, and openings clean and free of contamination. When not in use, protect fittings or hose ends using metal dust caps or
Figure 4-17.Reservoir level changes (reservoir sink) presence of air in system. 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 (+85F 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. |
 
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