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Aircraft hydraulic systems have operated at 3000 psi for many years. The hydraulic power within the aircraft however has consistently increased for each generation of aircraft. Higher pressure hydraulics has been studied based upon the smaller volume and lighter weight of the higher pressure hydraulics. The Model A/F27T-10 Hydraulic Component Test Stand is designed to provide the capability to test high pressure aircraft hydraulic components up to and including 8000 psi. The Test Stand is capable of automatic or fully independent manual operation and is designed for use in intermediate level activities in land based, ship board, or mobile van facilities.

The use of liquid automatic particle counters has blossomed in the fluid power industry. As with any data producing instrument, proper calibration and operation within the physical limits of the system are necessary to produce meaningful data. This paper will address some of the basic physical concepts behind the operation of the most common types of liquid automatic particle counters.