注意：确保单向活门已经安装，并且位置正确。
NOTE: Make sure that the check valve is installed and that it is in the correct position.
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).
必须同时从飞机外部和飞机内部接近组件下游单向活门。建议由两个机械员来完成此程序。
Access to the pack downstream check-valves must be obtained from both outside and inside the aircraft. Two persons are recommended for this procedure.
必须同时从飞机外部和飞机内部接近组件下游单向活门。建议由两个机械员来完成此程序。
Access to the pack downstream check-valves must be obtained from both outside and inside the aircraft. Two persons are recommended for this procedure.
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