loose pin
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首先在垫板内对准导向销和导向套，然后滑入防松套筒板。
First of all, within the target-oriented in the plate and guide pin sets, and then slide the sleeve nut plate.
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挡好，起落架安全销已插好，地面电源接好，请松刹车。
Chocks inserted, landing gear safety pins inserted, ground power unit on, release brakes, Please.
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模块上移
模块下移
不移动