747-400 AMM 飞机维护手册 LIFTING AND SHORING(6)

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____ body jacks and the tail jack) if the parameters are not more than the approved limits (i.e., 300,000- to 474,000-pound [136,000- to 215,000-kg] airplane in CG limits and airplane is not more than |3-degree roll and |1/2-degree pitch). Refer to Fig. 201 for CG/gross weight limits.
 Continuously monitor the jacks for correct vertical attitude and operation. Make sure the airplane stays level when you lift it.
 (h)  Lift the airplane to the necessary height.
 NOTE: If you will do a gear retraction test, lift the airplane
____ until there is a minimum of 4 inches of clearance below the tires. The total tail height in this jack position is 68.08 feet.
 S 492-016
 (2)  
When you get to the necessary height, install the wing and nose stabilizing jacks at points IV, V, VI, VII, and VIII as necessary.

 S 492-031

 (3)  
Put a load on the stabilizing jacks at points IV, V, VI, VII, and VIII to 16,000 to 24,000 pounds (7200 to 10,800 kg).

 G. Lower the Airplane.
 S 092-017
 (1)  
Remove the stabilizing jacks.

 S 942-018

 (2)  
Move all of the aerostands, ladders, jacks, work platforms, and entry stands out of the area that are not necessary.

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 S 862-019
 (3)  
Make sure the control lever for the landing gear is in the DN position.

 S 492-020

 (4)
Make sure all ground locks for the landing gear are installed.

 S 582-021

 (5)  
Lower the airplane.

 (a)  Follow the jacking system instructions to lower the airplane.
 NOTE: Continuously monitor the jacks for correct operation and
____ to make sure the airplane stays level when you lower it.
 S 862-022
 (6)  Do the "Put the airplane back to the ground mode" task
 (Ref 32-09-02/201).

 H. Put the Airplane to Its Usual Condition.
 S 092-023
 (1)  
Remove the power source and put away all power and control
 equipment.

 S 092-024

 (2)  
Make sure the airplane jacks are fully retracted and the jackscrew extensions are in the full down position.

 S 862-025
 CAUTION: DO NOT PERMIT THE AIRPLANE TO MORE FORWARD OR AFT ON THE JACKS
_______ BEFORE THE JACKS ARE SEATED. IF THE AIRPLANE MOVES, IT CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (3)  Make sure the wheel chocks are installed.
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 (4)  S 092-026Remove the jack pad adapters.
 (5)  S 412-027Install the jack pad covers.
 (6)  S 092-028Remove the shock strut locks if installed.
 (7)  S 612-029Inflate the shock struts if you used the shock strut locks (Ref 12-15-03/301, 12-15-04/301 and 12-15-05/301).

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 JACKING AIRPLANE NOSE - MAINTENANCE PRACTICES
_____________________________________________
 TASK 07-11-02-582-001
 1.  Lift the Airplane Nose On Jacks_______________________________
 A.  General
 (1)  This section gives instructions to lift the airplane nose on jacks. The nose of the airplane can be lifted by one of four different tasks.
 (a)  Lift the nose of the airplane by lifting the airplane at the primary wing to body jack points I and II, see Fig. 204.
　
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