Figure 5-17 shows that the lines on the hydraulicdiagram are identified as to purpose and the arrowspoint the direction of flow. Figure 5-18 and appendixII contain additional symbols and conventions usedon aircraft hydraulic and pneumatic systems and influid power diagrams.PLUMBING PRINTSPlumbing prints use many of the standard pipingsymbols shown in figure 5-9. MIL-STD-17B Parts Iand II lists other symbols that are used only inplumbing prints, some of which are shown in figure5-19.Figure 5-17.—Aircraft power brake control valve system.5-13
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