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(1) Do this task: Remove Pressure from the Rudder Hydraulic Systems A, B, and Standby,
TASK 27-21-00-800-802.
SUBTASK 27-21-91-860-027-001
(2) Open these circuit breakers and install safety tags:
CAPT Electrical System Panel, P18-1
Row Col Number Name
C 7 C00285 YAW DAMPER AC
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN 001-005, 155-157, 201-999 PRE SB 737-27-1253 27-21-91
Config 1
Page 413
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
Row Col Number Name
D 6 C01354 YAW DAMPER 2 DC
D 7 C00286 YAW DAMPER 1 DC
SUBTASK 27-21-91-010-008-001
(3) To get access to the main rudder, do this task:
Remove this access panel:
Number Name/Location
324DL Trailing Edge Access
F. Solenoid Valve Removal
SUBTASK 27-21-91-020-027-001
(1) Do these steps to remove the solenoid valve [71]:
(a) Remove the bolts [72] that attach the solenoid valve [71] to the main rudder pcu
installation [1].
(b) Remove the seal plate [73].
(c) Remove the O-ring [74]. Discard the O-ring [74].
(d) Remove the solenoid valve [71].
(e) Put plugs on the main rudder PCU ports.
------------------------- END OF TASK ---------------------------
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN 001-005, 155-157, 201-999 PRE SB 737-27-1253 27-21-91
Config 1
Page 414
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
Main Rudder PCU Load Limiter Solenoid Valve Installation
Figure 403 (Sheet 1 of 2)/27-21-91-990-808-001
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN 001-005, 155-157, 201-999 PRE SB 737-27-1253 27-21-91
Config 1
Page 415
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
Main Rudder PCU Load Limiter Solenoid Valve Installation
Figure 403 (Sheet 2 of 2)/27-21-91-990-808-001
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN 001-005, 155-157, 201-999 PRE SB 737-27-1253 27-21-91
Config 1
Page 416
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
TASK 27-21-91-400-805-001
5. Main Rudder PCU Load Limiter Solenoid Valve Installation
(Figure 403)
A. References
Reference Title
27-21-00-700-821-001 Authority Limiter Test (P/B 501)
27-21-00-800-802 Remove Pressure from the Rudder Hydraulic Systems A, B, and
Standby (P/B 201)
27-21-00-840-802 Put the Rudder Systems A, B, and Standby Back to the Condition
Before the Pressure Removal (P/B 201)
B. Consumable Materials
Reference Description Specification
D00153 Fluid - Hydraulic, Erosion Arresting, Fire Resistant BMS3-11, Type
IV
(interchange~
able&
intermixable
with Type V)
C. Location Zones
Zone Area
211 Flight Compartment - Left
324 Vertical Fin - Rear Spar To Trailing Edge
D. Access Panels
Number Name/Location
324DL Trailing Edge Access
E. Prepare for the Installation
SUBTASK 27-21-91-860-028-001
(1) Make sure you remove pressure from the rudder hydraulic systems A and B. To remove it, do
this task: Remove Pressure from the Rudder Hydraulic Systems A, B, and Standby,
TASK 27-21-00-800-802.
F. Solenoid Valve Installation
SUBTASK 27-21-91-020-028-001
(1) Do these steps to install the solenoid valve [71]:
(a) Remove the plugs on the main rudder PCU ports.
(b) Clean the seal plate [73].
(c) Lubricate the new O-ring [74] with fluid, D00153.
(d) Install the new O-ring [74].
(e) Install the seal plate [73].
(f) Install the solenoid valve [71].
(g) Install the bolts [72] that attach the solenoid valve [71] to the main rudder PCU.
(h) Tighten the bolts [72] to 50-70 pound-inches (5.6-7.9 newton-meters).
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN 001-005, 155-157, 201-999 PRE SB 737-27-1253 27-21-91
Config 1
Page 417
Oct 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
SUBTASK 27-21-91-860-029-001
(2) Do this task: Put the Rudder Systems A, B, and Standby Back to the Condition Before the
Pressure Removal, TASK 27-21-00-840-802.
SUBTASK 27-21-91-860-030-001
(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
　
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