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 S 865-002
 (6)  Move the control columns to the neutral position.
 S 865-003
 (7)  Do this task: "Put the Elevator Hydraulic Systems A and B Back to the Condition Before the Pressurization" (Ref 27-31-00/201).
 S 865-004
 (8)  Make sure all the valve handles are in the OPEN position.
 S 415-005
 (9)  Attach the locking bar to the module: (a) Turn the locking bar down and attach to the module. (b) Install the lower mounting bolt with the bolt head aft and a washer below the bolt head on each side of the module.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 415-006
 (10)
 Install the access door 3802 (Ref 12-31-41/201).

 S 415-012

 (11)
 Close the access door 3701 (Ref 12-31-41/201).

 S 615-001

 (12)
 If it is necessary, do this task:  "Service Hydraulic Reservoirs" (Ref/12-12-00/301).

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A
737-300/400/500MAINTENANCE MANUAL
 MANUAL ISOLATION VALVES - REMOVAL/INSTALLATION
______________________________________________
 1.  General_______
 A.  This procedure has two tasks, one for the removal and one for the installation of the manual isolation valve (which is referred to as the "valve"). The procedure has these parts:
 (1)  
The removal of the valve

 (2)  
The installation of the replacement valve.

 B.  
There are six valves in the isolation valve hydraulic module. The valve No. 2 supplies the hydraulic system A power to the rudder, and the valve No. 5 supplies the hydraulic system B power to the rudder.

 TASK 27-31-87-004-005
 2.  Manual Isolation Valves Removal_______________________________
 A.  References
 (1)  
12-31-41/201, Body Section 48 Access Doors and Panels

 (2)  
27-31-00/201, Elevator and Tab Control System

 B.  
Access

 (1)  
Location Zone
 702 Area 2 Tail Compartment Access Door

 (2)  
Access Panels
 3701 Stabilizer Trim Access Door

 C.  
Procedure

 S 864-001
 (1)  
Do this task: "Remove Elevator Hydraulic Systems A and B" (Ref 27-31-00/201).

 (2)  
Open the access door 3701 (Ref 12-31-41/201).

 S 024-003

 (3)  
Remove the valve from the module:

 (a)  
Remove the lower mounting bolt.

 (b)  
Turn the locking bar up to get access to the valve.

 (c)  
Remove the lockwire and the four mounting bolts.

 (d)  
Remove the valve from the module.

 (e)  
Install a plug in the valve chamber in the module.

 S 014-002
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SEE A
ISOLATION VALVES SEE B
LOCKING
BAR

MODULE
N0. 6 RIGHT ELEVATOR
HYDRAULIC LINE PCU AND ELEVATOR
(EXAMPLE) AUTOPILOT ACTUATOR (SYSTEM A) FWD
N0. 5 RUDDER PCU/YAW DAMPER (SYSTEM B)
A
N0. 4 FEEL ACTUATOR (SYSTEM B) BACKUPN0. 3 LEFT ELEVATOR RINGSPCU AND ELEVATOR AUTOPILOT (SYSTEM A)
N0. 2 RUDDER PCU/YAW DAMPER (SYSTEM A)
SEE C VALVE
N0. 1 FEEL ACTUATOR
(SYSTEM A)

MOUNTING
　
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