WARNING: DO NOT RETRACT THE NOSE LANDING GEAR WITH THE SHOCK STRUT
_______ RETENTION TOOL INSTALLED. RETRACTING THE NOSE LANDING GEAR WITH THE SHOCK STRUT RETENTION TOOL INSTALLED CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 CAUTION: MAKE SURE THE AREA BELOW THE AIRPLANE IS CLEAR OF ALL
_______ EQUIPMENT BEFORE THE SHOCK STRUT IS DEFLATED. IF YOU DO NOT OBEY THESE INSTRUCTION, DAMAGE TO THE AIRPLANE CAN OCCUR.
 (a)  When you lift the airplane and use the shock strut retention tool, deflate the nose gear (AMM 12-15-05/301).
 CAUTION: DO NOT USE THE SHOCK STRUT RETENTION TOOL ON INFLATED
_______ SHOCK STRUTS. THE RETENTION TOOL HAS A LOAD LIMIT.
 (b)  Install the shock strut retention tool on the nose landing gear.
 S 862-029
 (3)  To lift the airplane nose, do the steps that follow.
 (a)  Remove the jack pad covers from the main jack pad locations I and II (Fig. 203).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 07-11-02
 ALL  ú ú 01 Page 206 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

STABILIZINGPRIMARY BODY NOSEJACK POINTS JACK POINTI - LH
VI
II - RH (JACK NOT SHOWN)
JACKING POINTS  AND BUTTOCK LINE) LOCATION (BODY STA  LOAD IN POUNDS (KG) MAX STATIC 
I  LEFT BODY  STA 993.0 WBL 127.5  200,000 (90,700) 
II  RIGHT BODY  STA 993.0 WBL 127.5  200,000 (90,700) 
VI  NOSE  STA 400.0  39,400 (17,800) 
RBL 60 

NOTE: RBL = RIGHT BUTTOCK LINE; WBL = WING BUTTOCK LINE.
Jacking Points Data Figure 203
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 07-11-02
 ALL  ú ú 01 Page 207 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (b)  
Put the jacks directly below the jack pads at jack points I and

 II.

 (c)  
Turn the jacks until the line between two outboard footpads is parallel to the airplane centerline (Fig. 204).

 (d)  
Make sure the jack is level and in the center of the jack adapter.

 (e)  
Make sure the area below the airplane is clear of all equipment that is not necessary.

 (f)  
Put one person at each jack.

 NOTE: Make sure all persons talk to the coordinator on the
____
 interphone.

 (g)  
Release the airplane brakes.

 (h)  
Move the forward wheel chocks at the main gear, forward of the tires about 3-1/2 inches from tires.

 (i)  
Connect the power to the jack system.

 (j)  
Operate the jacks to set the jack in the jack adapters. Refer to the jack manufacturers' instructions and lift the airplane until the nose gear wheels are clear of the ground.

 NOTE: When it is available, a nose jack can be put in position
____ and preloaded to 8000 pounds (3600 kg) to make the airplane more stable.
 1)  Make sure the jack rams are locked before maintenance is done on the airplane.
 S 582-008
 (4)  Lower the airplane off the jacks.
 (a)  
Make sure the area below the airplane is clear.

 (b)  
If the nose jack was used, lower and remove nose jack before the main jacks are lowered.

 (c)  
Lower the main jacks. Refer to the jack manufacturers' instructions.

 NOTE: Make sure the jacks are at the bottom or the airplane
____
 full weight is on the landing gear.

 (d)  
Move the jacks away from the airplane.

 (e)  
Install the jack pad covers.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
中國航空網(wǎng) www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機(jī)維護(hù)手冊 LIFTING AND SHORING(9)