(15)
 Remove hydraulic pressure from system No. 4 (Ref 29-11-00/201).

 S 864-019
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 ALL  ú ú 01 Page 408 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 WING LANDING GEAR DOOR-OPERATED SEQUENCE VALVE MECHANISM - REMOVAL/INSTALLATION
_______________________________________________________________________________
 1.  General_______
 A. This procedure contains these two tasks:
 (1)  
The removal of the mechanism for the door-operated sequence valve for the wing landing gear

 (2)  
The installation of the mechanism for the door-operated sequence valve for the wing landing gear.

 B.
To remove the valve mechanism these steps are necessary:

 (1)  
Remove the valve cover

 (2)  
Disconnect the rod from the door fitting

 (3)  
Remove the carrier

 (4)  
Remove the load between the valve clevis and the link

 (5)  
Remove the rod from the carrier

 (6)  
Remove the mechanism.

 C.
To install the valve mechanism these steps are necessary:

 (1)  
Connect the rod to the carrier

 (2)  
Connect the carrier to the valve

 (3)  
Install the valve cover

 (4)  
Do a check of the door open adjustment

 (5)  
Do a check of the operation of the wheel well doors for the main landing gear.

 TASK 32-32-03-004-001
 2.  Wing Landing Gear Door-Operated Sequence Valve Mechanism Removal________________________________________________________________
 A. References
 (1)  
09-11-00/201, Towing

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

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

 (4)  
IPC 32-12-08 Fig. 1, IPC 32-32-02 Fig. 3

 B.
Access

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

 C.
Prepare for Removal

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 494-023
 WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1) Install the ground locks in all landing gear (Ref 09-11-00/201).
 S 494-024
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASKS 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 AND DAMAGE TO EQUIPMENT.
 (2)  
Do this task: "Wing Landing Gear Door Lock Installation"
 (Ref 32-00-30/201).

 S 494-019

 (3)  
Do this task: "Body Landing Gear Door Lock Installation"
 (Ref 32-00-30/201).

 S 864-004

 (4)
Remove pressure from hydraulic system No. 4 (Ref 29-11-00/201).

 D.
Remove the Valve Mechanism

 S 024-005
 (1)  
Remove the valve mechanism (Fig. 401):

 (a)  
Remove the four screws (15).

 (b)  
Remove the valve mechanism cover (16).

 (c)  
Remove the bolt (7).

 (d)  
Disconnect the rod (13) from the rod end (8) at point B.

 NOTE: Permit the rod and the valve to move to the door closed
____ position (valve clevis extended).
 (e)  
Remove the four bolts (3) that attach the carrier assembly (6) to the valve (1).

 (f)  
Remove the carrier bolt (5) that attaches the carrier assembly to its bracket.

 (g)  
　
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