(b)  
The depressurization of the hydraulic system No. 4

 (c)  
The removal of the control valve.

 (2)  
The installation of the ground spoiler control valve has these parts:

 (a)  
The installation of the control valve

 (b)  
An adjustment of the control valve

 (c)  
A test of the ground spoilers

 (d)  
The removal of the landing gear door locks

 TASK 27-62-04-004-001
 2.  Ground Spoiler Control Valve Removal (Fig. 401)____________________________________
 A.  References
 (1)  
24-22-00/201, Manual Control

 (2)  
29-11-00/201, Main Hydraulic Supply System

 (3)  
32-00-30/201, Landing Gear Door Locks

 (4)  
IPC 27-62-20 Fig. 2

 B.  
Access

 (1)  
Location Zone
 136 Wing Landing Gear Well, RH

 C.  
Procedure

 (1)  
Make sure the landing gear ground locks are installed.

 S 864-002
 S 494-003
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Do this task: "Wing Landing Gear Door Lock Installation" (Ref 32-00-30/201).

 (3)
Do this task: "Supply Electrical Power" (Ref 24-22-00/201).

 S 864-004
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-62-04
 ALL  ú ú 01 Page 401 ú Jun 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

SEE A
CONTROL ROD 
UP 1  RIG PIN SB-2 
PORT 
UP 2 
PORT  PRESSURE 
PORT 
GROUND SPOILER
CONTROL VALVE 
RETURN PORT 
A 
Ground Spoiler Control Valve Installation 
Figure 401 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-62-04
 ALL  ú ú 01 Page 402 ú Jun 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-005
 (4)  
Put the FLT CONTROL HYD POWER - WING system 4 switch on the overhead panel P5 to SHUTOFF.

 S 864-006

 (5)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P180 DC Power Distribution Panel
 1) 180E22 LATERAL CONT VLV SYS 4

 S 844-007
 (6)  
Do this task to depressurize hydraulic system No. 4: "Depressurize Hydraulic System" (Ref 29-11-00/201).

 S 024-008

 (7)  
Remove the control valve:

 (a)  
Remove the bolt that attaches the control rod to the control valve.

 (b)  
Disconnect the four hydraulic lines from the control valve.

 (c)  
Remove the bolts from the control valve.

 (d)  
Remove the control valve.

 (e)  
Install the caps on the hydraulic lines and in the control valve.

 TASK 27-62-04-404-009
 3.  Ground Spoiler Control Valve Installation (Fig. 401)_________________________________________
 A. Special Tools and Equipment
 (1)  
G12001-50 Rig Pin Kit

 B.
References

 (1)  
12-12-01/301, Hydraulic Systems

 (2)  
24-22-00/201, Manual Control

 (3)  
29-11-00/201, Main Hydraulic Supply System

 (4)  
32-00-30/201, Landing Gear Door Locks

 (5)  
IPC 27-62-20 Fig. 2

 C.
Access

 (1)  
Location Zone
 136 Wing Landing Gear Well, RH

 D.
Procedure

 S 424-010
 (1)  
Install the control valve:

 (a)  
Remove the caps from the hydraulic lines and from the control valve.
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 飛行操縱 FLIGHT CONTROLS 7(7)