291、 The surge tank drain check valve permits fuel in the surge tank to flow to either main tank 1 or main
tank 2.

　通气油箱排放单向活门允许通气油箱内的燃油流到 1 号或 2 号主油箱。

　通气油箱排放检查活门使通气油箱内的燃油流动于 1 号和 2 号油箱之间。

　通气油箱排放单向活门使通气油箱内的燃油流入 1 号及 2 号主油箱。

正确答案：A

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984、 Set the rotary switch to INPUT.

983、Servicing include information for servicing the aircraft with proper fuel and oil.

982、Select the hydraulic system that you will pressurize. 选择你要加压的液压系统。

981 、 Revisions are to be made consistent with the format of the specification using the provisions of

980、Replace nuts and washers if removed during inspection. Do not reuse.

979、Remove the sealant with a blunt scraper.

978。 Remove the rigging pins and equipment that prevent free movement of the control surfaces

977、remove the protective layer from one side of the new gasket with ANTENNA SIDE markings

976、 Remove the four screws that attach the flange to the cover.

975、remove oil and grease with a degreasing agent 用脱脂剂去除油脂

291、 The surge tank drain check valve permits fuel in the surge tank to flow to either main tank 1 or maintank 2.