Schematic diagrams shall be used when necessary to indicate flow and to illustrate the operation of air control, electrical, fluid-power, fuel and turbo systems in as straightforward as possible.
AA. 需要时使用示意图来表明流程，以尽可能简短的方式说明空气控制
BB. 必须使用示意图来表明流程，以尽可能简洁的方式说明空气控制
CC. 必要时使用示意图来表明流程，以尽可能直接的方式说明空气控制
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Arrows shall be used to indicate flow direction when needed to understand the schematic diagram.
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