757 Airplane Recovery Document 飞机恢复文件(72)

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B.  It can be necessary to use pneumatic bags. Be very careful. You must use a full tether system if the slope of the terrain is uneven. Pneumatic bags alone may not be stable.
C.  Jacks, cranes and slings are an alternative to pneumatic bags. They are safer and easier to use (see Figure 3-29).
8.  When You lift the Airplane with No Gear Folded
A.  You must lift an airplane in this condition if the gears are below the ground surface. You must lift the gears above the ground surface. This permits the airplane to be towed (or winched), after the ground surface has been prepared properly to support the airplane.
B.  You can use movable cranes with nylon slings to lift and hold the forward fuselage. Connect winches to the tow fittings on the main gears.
C.  You can use pneumatic bags with the cranes and slings. You can also use jacks at the primary jack points (wing and tail) to lift the gear above the ground surface. The ground surface must be prepared properly to support the jacks.
D.  Hard surfaces (plywood, steel or other material) can be necessary to make a temporary road. This road permits the lifted airplane to be moved.
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Figure 3-19 MODEL 757-200 NOSE GEAR FOLDED

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Figure 3-20 MODEL 757-200 MAIN GEAR FOLDED

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Figure 3-24 MODEL 757-300 NOSE GEAR FOLDED

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Figure 3-25 MODEL 757-300 MAIN GEAR FOLDED

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