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2) Install the unions [15] and new packings [16].
3) Install the unions [17] and new packings [18].
4) Install the reducer [19] and new packing [20].
(c) Connect the return line hydraulic system A [12] to the main rudder pcu installation [1].
(d) Connect the pressure line hydraulic system A [21] to the main rudder pcu installation [1].
(e) Connect the return line hydraulic system B [14] to the main rudder pcu installation [1].
(f) Connect the pressure line hydraulic system B [13] to the main rudder pcu installation [1].
(g) Remove the 1 U.S.-gal (3.81 l) oil resistant container, STD-203container placed below the
hydraulic connections.
SUBTASK 27-21-91-020-026-001
(7) Connect the electrical connectors [9] to the main rudder pcu installation [1].
SUBTASK 27-21-91-080-008-001
(8) Remove the rig pin R-5 from the rig pin kit, SPL-1585 from the rudder feel and centering unit.
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 411
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
SUBTASK 27-21-91-860-022-001
(9) 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 27-21-91-860-023-001
(10) 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 27-21-91-860-024-001
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.
(11) Do this task: Rudder Hydraulic System A, B, or Standby Pressurization,
TASK 27-21-00-800-801.
SUBTASK 27-21-91-870-003-001
(12) Move the rudder pedals to bleed the main rudder PCU until the movement of the rudder is
smooth.
SUBTASK 27-21-91-790-003-001
(13) Examine the hydraulic connections for leakage.
SUBTASK 27-21-91-860-025-001
(14) Do this task: Put the Rudder Hydraulic systems A, B, and Standby Back to the Condition
Before the Pressurization, TASK 27-21-00-840-801.
SUBTASK 27-21-91-820-005-001
(15) Do this task: Control Rod for Main Rudder Power Control Unit Adjustment,
TASK 27-21-00-820-809-001.
SUBTASK 27-21-91-730-012-001
(16) Do this task: Rudder Pedal Forces Test, TASK 27-21-00-700-816-001.
SUBTASK 27-21-91-730-013-001
(17) Do this task: Rudder Hinge Friction Test, TASK 27-21-00-700-823-001.
SUBTASK 27-21-91-730-014-001
(18) Do this task: Rudder Hinge Bearing and PCU Bearing Freeplay, TASK 27-21-00-700-814-001.
SUBTASK 27-21-91-730-015-001
(19) Do this task: Rudder Centering Test, TASK 27-21-00-700-815-001.
SUBTASK 27-21-91-730-016-001
(20) Do this task: Rudder Travel Test, TASK 27-21-00-700-817-001.
SUBTASK 27-21-91-730-017-001
(21) Do this task: Authority Limiter Test, TASK 27-21-00-700-821-001.
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 412
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
G. Put the Airplane Back to Its Initial Condition
SUBTASK 27-21-91-410-008-001
(1) Install this access panel:
Number Name/Location
324DL Trailing Edge Access
SUBTASK 27-21-91-410-009-001
(2) Close this access panel:
Number Name/Location
324CL Vertical Fin, Access
SUBTASK 27-21-91-410-010-001
(3) If it is necessary, do this task: Hydraulic Reservoir Servicing, TASK 12-12-00-610-801.
------------------------- END OF TASK ---------------------------
TASK 27-21-91-000-805-001
4. Main Rudder PCU Load Limiter Solenoid Valve Removal
(Figure 403)
A. General
(1) There is two solenoid valves and one transfer valve installed on the main rudder PCU. For the
transfer valve and yaw damper solenoid, refer to AMM 22-23-21/401.
(2) The main rudder PCU load limiter solenoid valve is referred to as the "solenoid valve" in this
procedure.
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
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 Removal
SUBTASK 27-21-91-860-026-001
　
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