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(3) Remove the safety tags and close these circuit breakers:
CAPT Electrical System Panel, P18-1
Row Col Number Name
C 7 C00285 YAW DAMPER AC
D 6 C01354 YAW DAMPER 2 DC
D 7 C00286 YAW DAMPER 1 DC
SUBTASK 27-21-91-410-012-002
(4) Install this access panel:
Number Name/Location
324DL Trailing Edge Access
------------------------- END OF TASK ---------------------------
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN 006-099, 101-122; GUN 001-005, 155-157, 201-999
POST SB 737-27-1253
27-21-91
Config 2
Page 417
Oct 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
STANDBY RUDDER POWER CONTROL UNIT SHUTOFF VALVE - MAINTENANCE PRACTICES
1. General
A. This procedure has these tasks:
(1) A removal of the rudder valve motor from the standby rudder power control unit (PCU) shutoff
valve
(2) An installation of the rudder valve motor to the standby rudder PCU shutoff valve
(3) A removal of the standby rudder power control unit (PCU) shutoff valve
(4) An installation of the standby rudder PCU shutoff valve
(5) An installation test of the standby rudder PCU shutoff valve.
B. The standby rudder PCU shutoff valve is referred to as the "shutoff valve" in this procedure.
C. You do not have to remove the shutoff valve from the modular package assembly to remove the
rudder valve motor.
TASK 27-21-94-000-801
2. Rudder Valve Motor Removal
(Figure 201, Figure 202)
A. General
(1) This task provides instructions to remove the rudder valve motor only.
B. References
Reference Title
27-21-00-800-802 Remove Pressure from the Rudder Hydraulic Systems A, B, and
Standby (P/B 201)
C. Location Zones
Zone Area
133 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station
727.00 - Left
D. Prepare for the Removal
SUBTASK 27-21-94-860-001
(1) Do this task: Remove Pressure from the Rudder Hydraulic Systems A, B, and Standby,
TASK 27-21-00-800-802.
SUBTASK 27-21-94-860-002
(2) Open these circuit breakers and install safety tags:
F/O Electrical System Panel, P6-2
Row Col Number Name
C 11 C00362 FLIGHT CONTROL SHUTOFF VALVES STBY RUD
C 13 C01074 FLIGHT CONTROL SHUTOFF VALVES FLT CONT
E. Rudder Valve Motor Removal
SUBTASK 27-21-94-020-001
(1) Disconnect the electrical connector [5] from the rudder valve motor [4].
SUBTASK 27-21-94-020-002
(2) Move the manual override lever [2] on the rudder valve motor [4] to position 2.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-21-94
Page 201
Oct 10/2005
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
SUBTASK 27-21-94-020-003
(3) Remove the screws [6] from the rudder valve motor [4].
SUBTASK 27-21-94-020-004
(4) Remove the rudder valve motor [4] from the shutoff valve [1].
------------------------- END OF TASK ---------------------------
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-21-94
Page 202
Oct 10/2003
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
Standby Rudder PCU Shutoff Valve Installation
Figure 201 (Sheet 1 of 2)/27-21-94-990-801
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-21-94
Page 203
Oct 10/2003
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
Standby Rudder PCU Shutoff Valve Installation
Figure 201 (Sheet 2 of 2)/27-21-94-990-801
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-21-94
Page 204
Oct 10/2003
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
Flight Control Switches
Figure 202/27-21-94-990-802
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-21-94
Page 205
Oct 10/2003
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
TASK 27-21-94-400-801
3. Rudder Valve Motor Installation
(Figure 201)
A. General
(1) This task provides instructions to install the rudder valve motor only.
B. References
Reference Title
27-21-00-840-802 Put the Rudder Systems A, B, and Standby Back to the Condition
Before the Pressure Removal (P/B 201)
SWPM 20-60-03 Standard Wiring Practices Manual
C. Consumable Materials
Reference Description Specification
G50171 Compound - Corrosion Inhibiting Compound,
　
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