22-12-01
 COUPLER  ú
 ú 01 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 516Jul 12/99 

A
737-300/400/500MAINTENANCE MANUAL
 S 865-018
 WARNING:_______ KEEP PERSONS AND EQUIPMENT CLEAR OF THE FLIGHT CONTROL
 SURFACES.  THESE COMPONENTS CAN MOVE SUDDENLY WHEN YOU SUPPLY
 HYDRAULIC POWER.  THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE

 TO EQUIPMENT.
 (4)  
Remove hydraulic power (AMM 29-15-00/201). S 865-016

 (5)  
Remove electrical power (AMM 24-22-00/201).

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 22-12-01
 COUPLER  ú
 ú 01 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 517Jul 12/99 

A
737-300/400/500MAINTENANCE MANUAL
 RUDDER SOLENOID AND TRANSFER VALVES - REMOVAL/INSTALLATION
__________________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is for the removal of the rudder transfer valve from the rudder power control unit (PCU). The second task is for the installation of the rudder transfer valve on the rudder PCU.
 B.  You can find the rudder PCU in the lower area of the vertical fin. The solenoid valve and the transfer valve are on the aft end of the rudder PCU.
 TASK 22-12-21-004-001
 2.  Rudder Solenoid and Transfer Valve Removal (Fig. 401)__________________________________________
 A.  References
 (1)  
AMM 12-31-51/201, Fin and Rudder Access Doors and Panels

 (2)  
AMM 20-10-44/401, Lockwire

 (3)  
AMM 29-15-00/201, Hydraulic Systems A, B, and Standby

 B.  Access
 (1)  
Location zone
 706 Vertical Stabilizer

 (2)  
Access Panel
 9512 TE Access Panel - Rudder
 9514 TE Access Panel - Rudder

 C.  Procedure
 S 864-024
 (1)  
Remove the hydraulic pressure from the rudder hydraulic systems A and B (AMM 29-15-00/201).

 S 864-003

 (2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Circuit Breaker Panel
 1) TRIM CONT RUD

 (b)  
P18 Circuit Breaker Panel
 1) YAW DAMPER AC

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 22-12-21
 ALL  ú ú 01 Page 401 ú Jul 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

RUDDER 
POWER UNIT 
MOUNTING BOLTS 
(4 PLACES) 
TRANSFER VALVE 
O-RING 
SEAL PLATE 
INPUT 
CONTROL 
ROD 

SEAL PLATE 
RUDDER 
POWER UNIT 
O-RING 
MOUNTING BOLTS 
(4 PLACES)  SOLENOID VALVE 
Rudder Solenoid and Transfer Valves Installation 
Figure 401 

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 22-12-21
 ALL  ú ú 01 Page 402 ú Feb 25/85
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 2) YAW DAMPER DC
 S 014-004
 (3)  
Remove the TE access panels at the lower area of the vertical stabilizer (AMM 12-31-51/201).

 S 864-025

 (4)  
Remove the rudder solenoid valve or transfer valve:

 (a)  
Remove the lockwire from the mounting bolts (AMM 20-10-44/401).

 (b)  
Remove the mounting bolts.

 (c)  
Remove the valve.

 (d)  
　
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