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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 BODY LANDING GEAR DOWNLOCK-OPERATED SEQUENCE VALVE AND MECHANISM -
________________________________________________________________ REMOVAL/INSTALLATION
____________________
 1.  General_______
 A.  This procedure contains four tasks:
 (1)  
The removal of the downlock-operated sequence valve for the body landing gear

 (2)  
The installation of the downlock-operated sequence valve for the body landing gear

 (3)  
The removal of the mechanism for the downlock-operated sequence valve for the body landing gear

 (4)  
The installation of the mechanism for the downlock-operated sequence valve of the body landing gear.

 B.  
To remove the downlock-operated sequence valve these operations are necessary:

 (1)  
Disconnect the hydraulic hoses

 (2)  
Remove the valve and the lever mechanism

 (3)  
Disconnect the valve from the lever mechanism.

 C.  
To install the downlock-operated sequence valve these operations are necessary:

 (1)  
Install the hydraulic fittings

 (2)  
Install the lever mechanism

 (3)  
Install the valve

 (4)  
Connect the hydraulic hoses

 (5)  
Do a check for leaks.

 D.  
To remove the mechanism for the downlock-operated sequence valve these operations are necessary:

 (1)  
Remove the striker arm

 (2)  
Disconnect the clevis assembly from the sequence valve

 (3)  
Remove the clevis assembly and the lever assembly.

 E.  
To install the mechanism for the downlock-operated sequence valve these operations are necessary:

 (1)  
Install the roller on the lever assembly

 (2)  
Connect the clevis assembly, the lever assembly and the link

 (3)  
Install the clevis assembly on the valve

 (4)  
Install the valve.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (5)  Install and adjust the striker arm.
 TASK 32-33-04-004-001
 2. Body Landing Gear Downlock-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)  
IPC 32-33-04 Fig. 2

 B.
Access

 (1)  
Location Zone
 755 Body Landing Gear, LH
 765 Body Landing Gear, RH

 C.
Procedure

 S 494-033
 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 OR DAMAGE TO EQUIPMENT.
 (2)  
Do this task: "Wing Landing Gear Door Lock Installation" (Ref 32-00-30/201).

 S 494-028

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

 (4)
Remove pressure from hydraulic system No. 1 (Ref 29-11-00/201).

 S 024-005

 (5)  
　
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