将再循环风扇的接耳放置在正确位置，安装垫片、螺钉、螺帽。
Put the recirculation fan lugs in position and install the washers, the bolts, the washers and the nuts.
从客舱再循环风扇（15）上拆下堵盖、从单向活门上拆下衬套。
Remove the blanking plugs from the cabin recirculation fan (15), the sleeve (1) and from the check valve (7).
注意：衬套（2）的末端必须在客舱再循环风扇（15）的涂色标记范围内。
NOTE : The end of the sleeve (2) must be within the colored markings painted on the cabin recirculation fan (15).
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