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(g) Remove the 1 U.S.-gal (3.81 l) oil resistant container, STD-203container placed below the
hydraulic connections.
SUBTASK 27-21-91-420-007-002
(6) Install the control rods [8]:
(a) Put the control rods [8] in its position with the adjustment end in the forward direction.
(b) Connect the control rods [8] to the external summing levers [3]:
1) Install the bolts [4], washers [5], washers [6], and nuts [7].
(c) Connect the control rods [8] to the input cranks [10]:
1) Install the bolts [41], washers [42], washers [43], and nuts [44].
SUBTASK 27-21-91-020-018-002
(7) Connect the electrical connectors [9] to the main rudder PCU [1].
SUBTASK 27-21-91-860-014-002
(8) 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 27-21-91-860-019-002
(9) Remove the safety tag and close this circuit breaker:
F/O Electrical System Panel, P6-2
Row Col Number Name
D 15 C01628 FLIGHT CONTROL FORCE FIGHT MONITOR
SUBTASK 27-21-91-860-015-002
(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.
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 410
Oct 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
SUBTASK 27-21-91-860-016-002
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 27-21-91-870-002-002
(12) Move the rudder pedals to bleed the main rudder PCU until the movement of the rudder is
smooth.
SUBTASK 27-21-91-790-002-002
(13) Examine the hydraulic connections for leakage.
SUBTASK 27-21-91-860-017-002
(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 27-21-91-820-002-002
(15) Do this task: Control Rod for the Main Rudder PCU Adjustment (AMM 27-21-00/501).
SUBTASK 27-21-91-820-003-002
(16) Do this task: Rudder Main PCU Force Fight Monitor Test (AMM 27-21-00/501).
SUBTASK 27-21-91-820-004-002
(17) Do this task: Main Rudder PCU Internal Hydraulic Leakage Test (AMM 27-21-00/501).
SUBTASK 27-21-91-730-007-002
(18) Do this task: Rudder Pedal Forces Test, TASK 27-21-00-700-816-002.
SUBTASK 27-21-91-730-008-002
(19) Do this task: Rudder Hinge Friction Test, TASK 27-21-00-700-821-002.
SUBTASK 27-21-91-730-009-002
(20) Do this task: Rudder Hinge Bearing and PCU Bearing Freeplay, TASK 27-21-00-700-814-002.
SUBTASK 27-21-91-730-010-002
(21) Do this task: Rudder Centering Test, TASK 27-21-00-700-815-002.
SUBTASK 27-21-91-730-011-002
(22) Do this task: Rudder Travel Test, TASK 27-21-00-700-817-002.
G. Put the Airplane Back to Its Initial Condition
SUBTASK 27-21-91-410-005-002
(1) Install this access panel:
Number Name/Location
324DL Trailing Edge Access
SUBTASK 27-21-91-410-007-002
(2) If it is necessary, do this task: Hydraulic Reservoir Servicing, TASK 12-12-00-610-801.
------------------------- 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 411
Oct 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
TASK 27-21-91-000-806-002
4. Main Rudder PCU Load Limiter Solenoid Valve Removal
(Figure 403)
A. General
(1) There is two load limiter solenoid valves, one yaw damper solenoid valve, 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) Each of the two main rudder PCU load limiter solenoid valves is referred to as the "solenoid
valve [71]" in this procedure. This procedure is applicable to both solenoid valves.
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
　
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