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Hydraulic fluid cooler
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Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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engine. The radiator unit consists of a cylindrical case containing two cooling coils of 1/4-inch aluminum alloy tubing and a replaceable fuel filter element. The utility system cooling coil is installed in the right-hand end of the case; the flight control system cooling coil and the filter element are installed in the left-hand end, as shown in figure 7-28. The case ends contain fittings for connecting fuel hoses. Two threaded bosses, which are welded to the cooling coil ends, serve to connect the hydraulic lines for each system. During normal operation, hydraulic fluid returning to each reservoir is directed through its applicable system cooling coil, where sufficient heat is transferred to the engine fuel to maintain the hydraulic fluid at less than 200°F. Should the cooling coils become clogged, each system is equipped with a bypass relief valve, which opens and bypasses fluid around the coil and directly to the reservoir. Fin Tubing Types Some aircraft use fin tubing for cooling hydraulic system fluid. Hydraulic fluid coolers are mounted internally in the wing inboard fuel tanks. As shown in figure 7-29, each cooler is an assembly of fin-walled tubing, two unions, and mounting supports. Fluid enters the inlet coupling and is passed through the fin-walled tubing, which acts as a heat exchanger, and is directed to the outlet coupling for return to the system reservoir. The heat of the fluid passing through the coolers is absorbed by both the fin-walled tubing and the fuel. NOTE: The fuel level in the inboard tanks must be maintained at a specific level to ensure adequate cooling of the fluid. MANIFOLDS A manifold is a hydraulic component used to conserve space and permit ease of unit removal and replacement. It also provides a means where common fluid lines may come together and be distributed to other subsystems. Manifolds are used in various types of installations, depending upon the needs of the system. Figure 7-29.—Fin tubing assembly Installation. 7-30







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