(1)
Remove the wing skin panels in the area above the main landing gear. Remove items in this area that prevent the necessary clearance. These items can be electrical wires or hydraulic lines. They can also be a part of the airplane secondary structure.
(2)
Install the sling around the MLG trunnion and attach to the shackle making sure that you have no interference between the slings and any airplane components (see Figure 3-62 or Figure 3-63).
(3)
Be careful when you lift the airplane. Make sure that you keep the airplane level and that you prevent a sudden movement of airplane loads. You must have a system that permits each person to speak with the other persons. This permits all three cranes to operate together. Tighten all the slings and cables before you start to lift the airplane. Start to lift the airplane slowly.
(4)
Stop regularly to examine the slings and the airplane attitude. Make the airplane level if it is necessary. When the airplane is at a satisfactory height, move it down to the necessary surface. The surface can be landing gears, jacks, supports (cribs) or trailers.
G.
If the MLG is sheared or partially sheared from its support structure and there is no structual damage to the MLG beam, it may still be possible to lift the airplane from the MLG beam by using a sling or straps (BEFORE USING THIS METHOD, REQUEST AND OBTAIN APPROVAL FROM THE BOEING COMPANY), see Figure 3-64.
NOTE: OBTAIN APPROVAL FROM THE BOEING COMPANY BEFORE USING A SLING OR STRAPS TO LIFT THE AIRPALEN FROM THE MLG BEAM, WHEN THE MLG TRUNNION IS SHEARED OR PARTIALLY SHEARED.
(1)
Remove the wing skin panels in the area above the main landing gear. Remove items in this area that prevent the necessary clearance. These items can be electrical wires or hydraulic lines. They can also be a part of the airplane secondary structure.
(2)
Make sure the inboard and outboard stabilizer struts are in place and secure.
(3)
Be careful when you lift the airplane. Make sure that you keep the airplane level and that you prevent a sudden movement of airplane loads. You must have a system that permits each person to speak with the other persons. This permits all three cranes to operate together. Tighten all the slings and straps (remove slack) before you start to lift the airplane. Start to lift the airplane slowly.
(4)
Stop regularly to examine the sling or straps, and the airplane attitude. Make the airplane level if it is necessary. When the airplane is at a satisfactory height, lower it down to the necessary surface. The surface can be landing gears, jacks, supports (cribs) or trailers.
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WHEN YOU LIFT THE AIRPLANE WITH THREE CRANES Page 3-106 Jul 01/2005
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H. The following table summarizes the hoist equipment to use for each lifting scenario when you use three cranes picking up from the MLG and the MLG support structure. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 Airplane Recovery Document 飞机恢复文件(92)
