757 Airplane Recovery Document 飞机恢复文件(78)

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D.  You can also use the jack points on the main landing gear (MLG) and the nose landing gear (NLG) to lift the airplane (see Figure 3-32 or Figure 3-33). If you do not have sufficient clearance for the usual axle jacks, you can use special equipment for this airplane. You install this special equipment onto the axle of each landing gear. There is one option for MLG jacking with mimimal clearance conditions:
(1)  Jack using J07003-15 -"Landing Gear Jacking Bar"; This equipment is shown in Figure 3-45.
The J07003-15 jacking equipment is used to lift the main landing gear when there is insufficient clearance under the forward and aft axle to access the built-in jack lugs.
E.  The limits for jack loads are shown in Figure 3-34 through Figure 3-37.
F.  Prepare to Use the Jacks
(1) Make sure you complete the procedures shown in SECTION 3-20 of this Chapter.
3-30-5

IMPORTANT DATA ABOUT THE JACKS
Page 3-65 Jul 01/2005 D623N004
 

(2)  
Examine the available jacks. Make sure they are the correct type. Check manufacturers specifications for the jacks being used to determine the load limits of the jacks and the ground clearances.

(3)  
Make sure that the ground surface below the jack has a sufficient strength for the jack loads. It is possible that you must remove the ground material and replace it with better material (rock or gravel). See SUBJECT 2-10-3 for more data.

(4)  
Make sure the area below the jack is level and flat. Then the jack will have a correct vertical attitude. See SUBJECT 3-30-6 for jack surface preparation.

(5)  
Install the jack pads (adapters).

(6)
Compress the jack to its minimum height.

NOTE:  YOU CAN START TO LIFT THE AIRPLANE WITH AXLE JACKS. THEN WHEN YOU HAVE A SUFFICIENT HEIGHT, YOU CAN USE THE USUAL TRIPOD JACKS.

(7)  
Use supports (cribbing) if it is necessary below the jacks. Make the supports as level as possible with a large flat surface to correctly hold the jack. When you start, make the dimensions of the flat surface sufficient to permit changes in the jack positions. These changes will be necessary while you align the jack for each turn adjustment of the airplane. The turn adjustment can be very large (10 to 15 inches or 25 to 38 cm) when you lift only the lower wing.

(8)  
You must monitor the horizontal movement of the airplane while you operate the jacks. You can tape plumb lines to the bottom centerline of the airplane. You can also attach plumb lines to some locations on the sides of the fuselage. Then put targets in the ground below each point to monitor the movement of the airplane.

(9)  
Install load gages on all the jacks. Monitor the gages to make sure that you do not use loads that are too large. Write the maximum permitted load on the airplane by each jack pad.

(10)  
Make sure that all recovery persons know the procedure. It must be possible for each person to speak with the other persons while you do the procedure. Then each person can adjust to the problems that occur. This permits you to prevent injury to each person
　
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