757 Airplane Recovery Document 飞机恢复文件(98)

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I.  Make sure you do not turn the airplane more than the radius limits shown in Figure 4-6 and Figure 4-7
J.  Refer to Figure 4-6 and Figure 4-7 for clearance information.
K.  When towing an airplane back onto the runway make sure the surface where the tires will meet the runway is level. If the surface the tires are on isn’t level with the runway damage may occur internally to the tires that can’t be seen. It is recommended that the tires be replaced if this happens. See SUBJECT 2-10-4 for example of prepared surfaces.
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4-10-2 When the Airplane is Off the Runway on Hard Ground
1.  When the airplane moves off the runway, the wheels push down the soil and increase its strength in these locations. The soil is stronger for a depth of some inches. Be careful. Do not remove this layer of stronger soil in a removal operation. You can find the soil strength when you measure the wheel or tire depth (rut depth). See SECTION 2-10, Figure 2-4 through Figure 2-7.
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4-10-3 When the Airplane is Off the Runway on Soft Ground
1.  
The ground can also be soft after the movement of the airplane on it. You can find the soil strength when you measure the wheel or tire depth (rut depth); see Figure 2-4, Figure 2-4 and Figure 2-5. Support structures (shoring or cribbing) can also be necessary.

2.  
The removal area for bad material must have a minimum width to make it possible to tow the airplane. This area must also extend in the tow direction to the nearest surface with a sufficient strength for the airplane. The slope must be 5 degrees maximum. If water comes into the removal area, use pumps to keep a minimum height of water. Put the pumps in areas where there are no gases (fuel vapors).

3.  
You must make the bottom of the removal area stronger. You must install a layer of some loose material (crushed rock) or some hard material (quick-set cement). If you use loose material, you must push it down (compact it) and put a cover on it. You can make the cover from some wood (plywood or cross ties), some steel or some other material (matting); see Figure 4-9 and Figure 4-10 and SECTION 2-10 for additional information on prepared surfaces.

4.  
It is possible to put a cover directly on the ground when you do not prepare the soil. Use the wheel depth (rut depth) to make sure that the soil strength is sufficient for this procedure. See SECTION 2-10.
　
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