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323CL Vertical Fin, Rear Spar Access Door
323FL Vertical Fin, Access
324DL Trailing Edge Access
SUBTASK 27-21-61-210-002
(2) Do a general visual inspection of the Rudder Aft Quadrant, Torque Tube Assembly, Feel and
Centering Unit, and associated Input/Output rods.:
(a) Aft quadrant
(b) Aft quadrant output rod
(c) Aft quadrant bearings
(d) Aft quadrant shaft
(e) Rudder torque tube
(f) Rudder torque tube bearings
(g) Rudder torque tube cranks
(h) Rudder torque tube input rods
(i) Feel and centering unit.
(j) Feel and centering unit output rod.
SUBTASK 27-21-61-010-010
(3) Close these access panels:
Number Name/Location
323CL Vertical Fin, Rear Spar Access Door
323FL Vertical Fin, Access
324DL Trailing Edge Access
------------------------- END OF TASK ---------------------------
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-21-61
Page 608
Feb 10/2006
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
RUDDER CONTROL TORQUE TUBE - REMOVAL/INSTALLATION
1. General
A. This procedure has these tasks:
(1) A removal of the rudder control torque tube
(2) An installation of the rudder control torque tube.
B. The rudder control torque tube is referred to as the "torque tube" in this procedure.
TASK 27-21-71-000-803-001
2. Rudder Control Torque Tube Removal
(Figure 401)
A. References
Reference Title
27-21-00-800-802 Remove Pressure from the Rudder Hydraulic Systems A, B, and
Standby (P/B 201)
27-21-87-000-801 Rudder Trim Actuator Removal (P/B 401)
B. Tools/Equipment
NOTE: When more than one tool part number is listed under the same "Reference" number, the
tools shown are alternates to each other within the same airplane series. Tool part numbers
that are replaced or non-procurable are preceded by "Opt:", which stands for Optional.
Reference Description
SPL-1585 Kit - Rigging Pins, All Systems
(Part #: F70207-109, Supplier: 81205, A/P Effectivity: 737-600, -700,
-700C, -700ER, -700QC, -800, -900, -900ER, -BBJ)
C. Location Zones
Zone Area
324 Vertical Fin - Rear Spar To Trailing Edge
D. Access Panels
Number Name/Location
324BL Vertical Fin, Trailing Edge Access
324DL Trailing Edge Access
E. Prepare for the Removal
SUBTASK 27-21-71-860-005-001
(1) Do this task: Remove Pressure from the Rudder Hydraulic Systems A, B, and Standby,
TASK 27-21-00-800-802.
SUBTASK 27-21-71-010-003-001
(2) Remove these access panels:
Number Name/Location
324BL Vertical Fin, Trailing Edge Access
324DL Trailing Edge Access
SUBTASK 27-21-71-480-002-001
(3) Install the rig pin R-5 from the rig pin kit, SPL-1585 in the output crank of 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 27-21-71
Config 1
Page 401
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
F. Torque Tube Removal
(Figure 401)
SUBTASK 27-21-71-020-016-001
(1) Remove the nut [39], washer [38], washer [37], and bolt [36] to disconnect the vernier control rod
[5] from the upper crank [35].
SUBTASK 27-21-71-020-017-001
(2) Remove the nut [34], washer [33], washer [32], and bolt assembly [31] to disconnect the vernier
control rod [9] from the center crank [30].
SUBTASK 27-21-71-020-018-001
(3) Remove the nut [20], washer [19], and bolt [18] to disconnect the aft quadrant control rod [21]
from the lower crank [22].
SUBTASK 27-21-71-020-019-001
(4) Remove the nut [16], nut [15], washer [14], and bolt [13] to disconnect the control rod [17] from
the lower crank [22].
SUBTASK 27-21-71-020-021-001
(5) Remove the rudder trim actuator, do this task: Rudder Trim Actuator Removal,
TASK 27-21-87-000-801
SUBTASK 27-21-71-020-020-001
(6) Remove the torque tube [1]:
(a) Use a marker or pen to make marks to identify the installed positions of the lower crank
[22], center crank [30], and upper crank [35].
(b) Remove the nuts [25], washers [24], bolts [23] that attach the lower crank [22] to the torque
tube [1].
(c) Remove the nuts [12], washers [11], bolts [10] that attach the center crank [30] to the torque
tube [1].
(d) Remove the nuts [8], washers [7], bolts [6] that attach the upper crank [35] to the torque
tube [1].
(e) Remove the bolts [2] and washers [3] from the upper bearing housing [4].
(f) Remove the nuts [29], washers [28], and bolts [27] that attach the lower bearing housing
　
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