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AC 43.13-1B 9/8/98 such that the indicator cannot be reset, unless the filter bowl is removed and the element re placed. c. Flushing a Hydraulic System. When inspection of hydraulic filters or hydraulic fluid evaluation indicates that the fluid is con taminated, flushing the system may be neces sary. This must be done according to the manufacturer’s instructions; however, a typical procedure for flushing is as follows: (1) Connect a ground hydraulic test stand to the inlet and outlet test ports of the system. Verify that the ground unit fluid is clean and contains the same fluid as the air craft. (2) Change the system filters. (3) Pump clean, filtered fluid through the system, and operate all subsystems until no obvious signs of contamination are found during inspection of the filters. Dispose of contaminated fluid and filter. (Note: A visual inspection of hydraulic filters is not always ef fective.) (4) Disconnect the test stand and cap the ports. (5) Ensure that the reservoir is filled to the FULL line or proper service level. d. Inspections. Hydraulic and pneumatic systems are inspected for leakage, worn or damaged tubing, worn or damaged hoses, wear of moving parts, security of mounting for all units, safetying, and any other condition speci fied by the maintenance manual. A complete inspection includes considering the age, cure date, stiffness of the hose, and an operational check of all subsystems. (1) Leakage from any stationary con nection in a system is not permitted, and if found, it should be repaired. A small amount of fluid seepage may be permitted on actuator piston rods and rotating shafts. In a hydraulic system, a thin film of fluid in these areas indi cates that the seals are being properly lubri cated. When a limited amount of leakage is allowed at any point, it is usually specified in the appropriate manual. (2) Tubing should not be nicked, cut, dented, collapsed, or twisted beyond approved limits. The identification markings or lines on a flexible hose will show whether the hose has been twisted. (See figure 9.9.) (3) All connections and fittings associ ated with moving units must be examined for play evidencing wear. Such units should be in an unpressurized condition when they are checked for wear. (4) Accumulators must be checked for leakage, air or gas preload, and position. If the accumulator is equipped with a pressure gauge, the preload can be read directly. (5) An operational check of the system can be performed using the engine-driven pump, an electrically-operated auxiliary pump (if such a pump is included in the system), or a ground test unit. The entire system and each subsystem should be checked for smooth op eration, unusual noises, and speed of operation for each unit. The pressure section of the sys tem should be checked with no subsystems to see that pressure holds for the required time without the pump supplying the system. Sys tem pressure should be observed during opera tion of each subsystem to ensure that the en gine-driven pump maintains the required pres sure. e. Troubleshooting. Hydraulic system troubleshooting varies according to the com plexity of the system and the components in the system. It is, therefore, important that the Page 9-16 Par 9-29PDF Image | AFS-640
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