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POST SB 737-27-1253
27-21-71
Config 2
Page 405
Oct 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
TASK 27-21-71-400-802-002
3. Rudder Control Torque Tube Installation
(Figure 401)
A. References
Reference Title
27-21-00-700-817-002 Rudder Travel Test (P/B 501)
27-21-00-820-809-002 Control Rod for Main Rudder Power Control Unit Adjustment
(P/B 501)
27-21-00-820-810-002 Control Rod for Standby Rudder Power Control Unit Adjustment
(P/B 501)
27-21-00-840-802 Put the Rudder Systems A, B, and Standby Back to the Condition
Before the Pressure Removal (P/B 201)
27-21-87-400-801 Rudder Trim Actuator Installation (P/B 401)
B. Consumable Materials
Reference Description Specification
D00015 Grease - Aircraft Bearing BMS3-24
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. Torque Tube Installation
SUBTASK 27-21-71-420-006-002
(1) Install the torque tube [1]:
(a) Make sure that the plate [40], lower bearing housing [21], retainer [41], and plate [42] in
their positions on the torque tube [1].
(b) Put the torque tube [1] through the structural cutouts, center cranks [29], upper crank [34],
and upper bearing housing [35].
NOTE: Put the center cranks [29] and upper crank [34] in their original position before
you put the torque tube [1] through the structural cutouts.
(c) Install the bolts [37], washers [38], and nuts [39] to attach the lower bearing housing [21] to
the airplane structure.
(d) Install the center cranks [29] on the torque tube [1]:
1) Install the bolts [24], bolts [28], washers [25], washers [26], and nuts [27] to attach the
center cranks [29] to the torque tube [1].
2) Tighten the nuts [27] to 15-25 pound-inches (1.69-2.82 newton-meters) above the run-on
torque.
(e) Install the upper crank [34] to the torque tube [1]:
1) Install the bolt [24], bolt [28], washers [25], washers [26], and nuts [27] to attach the
upper crank [34] to the torque tube [1].
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
27-21-71
Config 2
Page 406
Oct 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
2) Tighten the nuts [27] to 15-25 pound-inches (1.69-2.82 newton-meters) above the run-on
torque.
SUBTASK 27-21-71-710-004-002
(2) Make sure the torque tube [1] turns freely and that there is no play in the horizontal and vertical
directions.
(a) If the torque tube [1] does not turn freely, do a check of the lower bearing housing [21] and
upper bearing housing [35] installation.
SUBTASK 27-21-71-420-007-002
(3) Install the bolt assembly [30], washer [31] (under the bolt), washer [32] (under the nut), and nut
[33] to connect the control rod [2] to the upper crank [34].
SUBTASK 27-21-71-420-008-002
(4) Install the bolt assemblies [30], washers [31] (under the bolt), washers [32] (under the nut), and
nuts [33] to connect the control rods [3] to the center cranks [29].
SUBTASK 27-21-71-420-009-002
(5) Install the rudder trim actuator [18], do this task: Rudder Trim Actuator Installation,
TASK 27-21-87-400-801
SUBTASK 27-21-71-420-010-002
(6) Install the bolt [9], washer [10], and nut [11] to connect the aft quadrant rod [12] to the lower crank
[20].
SUBTASK 27-21-71-420-011-002
(7) Connect the control rod [8] to the lower crank [20]:
(a) Install the bolt assembly [4], washer [5], and nut [6].
1) Tighten the nut [6] to 45-60 pound-inches (5.1-6.8 newton-meters).
CAUTION: DO NOT TRY TO TIGHTEN THE NUT [6] AGAIN AFTER YOU TIGHTEN THE NUT [7],
YOU CAN CAUSE DAMAGE TO EQUIPMENT.
(b) Install the nut [7].
1) Tighten the nut [7] to 12-15 pound-inches (1.3-1.7 newton-meters).
SUBTASK 27-21-71-640-002-002
(8) Apply grease, D00015 to the upper bearing housing [35] and lower bearing housing [21].
(a) Fill the upper bearing housing [35] and lower bearing housing [21] with grease, D00015
until the grease is level with the surrounding structure.
SUBTASK 27-21-71-860-004-002
(9) 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.
F. Rudder Control Torque Tube Installation Test
SUBTASK 27-21-71-820-003-002
(1) Do this task: Control Rod for Main Rudder Power Control Unit Adjustment,
TASK 27-21-00-820-809-002.
SUBTASK 27-21-71-820-004-002
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL飞机维护手册2(104)
