(3)  
Connect the hydraulic lines to the valve

 (4)  
Do a check of the door open adjustment.

 D.  
The door-operated sequence valve for the wing landing gear permits hydraulic system No. 4 pressure, in the correct sequence, to these components:

 (1)  
The uplock actuator

 (2)  
The downlock actuator

 (3)  
The actuator for the wing landing gear.

 E.  
The valve is on the aft wall of the wheel well for the wing landing gear.

 TASK 32-32-02-004-001
 2.  Wing Landing Gear Door-Operated Sequence Valve 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)  
32-12-01/401, Wing Gear Wheel Well Outboard Door

 (5)  
IPC 32-32-02 Fig. 3

 B.  
Access

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

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747-400 MAINTENANCE MANUAL
 C. Procedure
 S 494-014
 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 494-003
 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 494-009

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

 S 864-004

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

 S 024-005

 (5)  
Remove the sequence valve (Fig. 401):

 (a)  
Disconnect the hydraulic lines from the valve.

 (b)  
Install a plug on the hydraulic lines.

 (c)  
Remove the four screws (10) and the mechanism cover (11).

 (d)  
Remove the bolt (6).

 (e)  
Disconnect the rod (8) from the rod end (7).

 NOTE: Permit the rod and the valve to move to the door closed
____ position (valve clevis extended).
 (f)  
Remove the four bolts (4) that attach the carrier assembly to the valve.

 (g)  
Remove the bolts (2) that attach the valve (1) to its bracket.

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747-400
MAINTENANCE MANUAL

SEE  A  B 
MECHANISM COVER  UNL  DNC DN  UPC RET  UP  DOOR-OPERATED SEQUENCE VALVE 

VALVE ATTACH BOLTS
POINT A
(RIGGING PIN HOLE)

FWDACTUATOR ROD
A

Wing Landing Gear Door-Operated Sequence Valve Installation
Figure 401 (Sheet 1)

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747-400
MAINTENANCE MANUAL

11.  MECHANISM COVER  UNL  DN DNC  UPC RET  UP 1.  DOOR-OPERATED SEQUENCE VALVE 
　
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