552、通气油箱排放单向活门是在 1 号和 2 号主油箱外侧油箱端部肋上。

　 A surge tank drain single valve is on the outside fuel tank end rib in main tank 1 and main tank 2.

　 A surge tank drain one way value is on the inboard fuel tank end rib in main tank 1and main tank 2.

　 A surge tank drain check valve is on the outboard fuel tank end rib in main tank 1and main tank 2

正确答案：C

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722、 Perform preliminary inspection of all articles that are maintained

721、Make sure that you turn the control knob counterclockwise

720、 Make sure that you remove all tools and equipment.

719、Make sure that the indication on the gauge agrees with the quantity that is in the tank.

718、 Make sure that the cabin pressure stays constant.

717、lf test result fail, the repair extent should be depended on the troubles

716、 Keep tools away and pick up debris near the engine

715、Keep all the' parts that are serviceable and discard those that are broken.

714、Increase the pressure slowly ( )

713、In the alternative, the acronym CAP may be used