747-400 AMM 飞机维护手册 LIFTING AND SHORING(27)

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 65B16363-1M-556087F STANCHION SUPPORT  ú
 FITTING BE INSTALLED PRIOR TO ADAPTER  ú 03 Page 206 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 D. Support the Tail at Jack Pad III (Fig. 202).
 S 492-009
 (1)  Preload the jack to between 5,000 - 10,000 pounds (2,000 - 4,500 kilograms).
 S 492-013
 CAUTION:_______YOU MUST KEEP A LOAD ON THE JACK AT ALL TIMES. IF YOU DO NOT KEEP A LOAD ON THE JACK YOU CAN CAUSE STRUCTURAL DAMAGE TO THE AIRPLANE.
 (2)  Keep a 5,000 pound (2,200 kilogram) minimum load while the jack is in place.
 E. Remove the Tail Support at Jack Pad III (Fig. 202).
 S 582-011
 (1)  
Follow the jack instructions to lower the jack.

 S 092-012

 (2)  
Make sure the airplane jack is fully retracted and the jackscrew extension is in the full down position.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANE RM852 REQUIRES  ú 07-11-08
 65B16363-1M-556087F STANCHION SUPPORT  ú
 FITTING BE INSTALLED PRIOR TO ADAPTER  ú 04 Page 207 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 SHORING - MAINTENANCE PRACTICES
_______________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task gives steps to shore the airplane body. The second task gives steps to shore the airplane wings.
 B.  This procedure gives steps and limits when you shore the body and the wings of the airplane.
 C.  In all cases when you will hold the airplane other than with the main landing gear, the jack positions should be included as a point of support. The airplane should be shored on a hard surface in the most level ground area available. If it will be outside, take into consideration the wind conditions and blast effects from other airplanes.
 D.  If more data is necessary, refer to SRM 51-50-02 of the Structural Repair Manual.
 TASK 07-20-00-582-012
 2.  Body Shoring (Fig. 201)____________
 A.  References
 (1)  AMM 07-11-02/201, Jacking Airplane
 B.  Procedure
 S 582-002
 (1)  
Lift the airplane on the jacks at the jack points I, II, and III (AMM 07-11-01/201).

 S 492-003

 (2)  
Put the shoring below the body at the shore points shown (Fig. 201).

 NOTE: When you shore the body, you will usually lift the body on
____ the jacks, then lower it onto supplementary body supports.
 The aft body jack is not on the airplane centerline and therefore has a tendency to twist the body. When this will have an unwanted effect on the repairs you will make, you can remove the aft body jack. Do this only if you installed the supplemental body supports and have the correct loads on them.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 07-20-00
 ALL  ú ú 01 Page 201 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

PRIMARY JACK POINT III (MAXIMUM
PRIMARY JACK POINT II (MAXIMUM
AUXILIARY JACK AUXILIARY JACK POINT VII (RIGHT WING POINT VIII) (MAXIMUM ALLOWABLE LOAD 25,000 POUNDS [11,300 KG])

SUPPORT LOCATION SUPPLEMENTARY  IN JIGGED POSITION MAXIMUM ALLOWABLE LOAD 
BS 540.00  18,000 POUNDS (8,100 KG) 
BS 740.00 BS 720.00  36,000 POUNDS (16,300 KG) 1 
BS 1740.00  16,000 POUNDS (7,200 KG) 
BS 1960.00  16,000 POUNDS (7,200 KG) 
BS 2180.00  16,000 POUNDS (7,200 KG) 
BS 2484.00  40,000 POUNDS (18,100 KG) 

SUPPORT LOCATION  LOAD IN JIGGED POSITION THEORETICAL SUPPORT 
WS 557.42  REAR SPAR FRONT SPAR  11,700 POUNDS (5,300 KG) 34,800 POUNDS (17,400 KG) 
WS 1028.0  REAR SPAR FRONT SPAR  0 27,900 POUNDS (12,600 KG) 
WS 1485.0  REAR SPAR FRONT SPAR  550 POUNDS (240 KG) 3,500 POUNDS (1,500 KG) 
OUTBOARD NACELLE  6,780 POUNDS (3,000 KG) 
　
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