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9/8/98 AC 43.13-1B g. When handling Skydrol/Hyjet hy- draulic fluids, gloves that are impervious to the fluid must be worn. If skin contact occurs, wash with soap and water. h. When handling phosphate ester- based fluid use eye protection. If the eye is exposed to fluid, severe eye pain will occur. i. When Skydrol/Hyjet mist or vapor exposure is possible, a respirator capable of removing organic vapors and mists must be worn. j. Ingestion of any hydraulic fluid should be avoided. Although small amounts do not appear to be highly hazardous, any sig nificant amount should be tested in accordance with manufacturer’s direction, followed with hospital supervised stomach treatment. 9-29. HYDRAULIC SYSTEM MAINTE- NANCE PRACTICES. The maintenance of hydraulic and pneumatic systems should be performed in accordance with the aircraft manufacturer’s instructions. The following is a summary of general practices followed when dealing with hydraulic and pneumatic systems. a. Service. The servicing of hydraulic and pneumatic systems should be performed at the intervals specified by the manufacturer. Some components, such as hydraulic reservoirs, have servicing information adjacent to the compo nent. When servicing a hydraulic reservoir, make certain to use the correct type of fluid. Hydraulic fluid type can be identified by color and smell; however, it is good practice to take fluid from the original marked container and then to check the fluid by color and smell for verification. Fluid containers should always be closed, except when fluid is being removed. b. Contamination Control. Contamina tion, both particulate and chemical, is detri mental to the performance and life of compo nents in the aircraft hydraulic system. Con tamination enters the system through normal wear of components, by ingestion through ex ternal seals, during servicing, or maintenance when the system is opened to replace/repair components, etc. To control the particulate contamination in the system, filters are in stalled in the pressure line, in the return line, and in the pump case drain line of each system. The filter rating is given in terms of “micron,” and is an indication of the particle size that will be filtered out. The replacement interval of these filters is established by the manufac turer and is included in the maintenance man ual. However, in the absence of specific re placement instructions, a recommended serv ice life of the filter elements is: Pressure filters3000 hrs. Return Filters1500 hrs. Case drain filters600 hrs. (1) When replacing filter elements, be sure that there is no pressure on the filter bowl. Protective clothing and a face shield must be used to prevent fluid from contacting the eye. Replace the element with one that has the proper rating. After the filter element has been replaced, the system must be pressure tested to ensure that the sealing element in the filter as sembly is intact. (2) In the event of a major component failure, such as a pump, consideration must be given to replacing the system filter elements, as well as the failed component. System filters may also be equipped with differential pres sure (∆P) indicators. These indicators are de signed to “pop-up” when the pressure drop across the element reaches a predetermined value caused by contamination held by the element. The indicators are designed to pre vent false indications due to cold start, pump ripple, and shock loads. Consequently, a filter whose indicator has been activated must be re placed. In fact, some indicator designs are Par 9-28 Page 9-15PDF Image | AFS-640
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