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E. Rudder Trim Actuator Installation
(Figure 401)
SUBTASK 27-21-87-860-003
(1) Make sure that these circuit breakers are open:
F/O Electrical System Panel, P6-2
Row Col Number Name
D 16 C00788 FLIGHT CONTROL TRIM IND RUD
D 19 C00787 FLIGHT CONTROL TRIM CONT RUD
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SUBTASK 27-21-87-860-004
(2) Make sure that you remove pressure from the rudder hydraulic systems A and B. To remove
them, do this task: Remove Pressure from the Rudder Hydraulic Systems A, B, and Standby,
TASK 27-21-00-800-802.
SUBTASK 27-21-87-420-001
(3) Install the rudder trim actuator [1]:
(a) Install the bolt assembly [8], bushing [14], washer [13], and nut [12] to connect the rudder
trim actuator [1] to the airplane structure.
1) Tighten the nut [12] to 85-100 pound-inches (9.6-11.3 newton-meters).
CAUTION: DO NOT TRY TO TIGHTEN THE NUT [12] AGAIN AFTER YOU TIGHTEN THE NUT
[10], YOU CAN CAUSE DAMAGE TO EQUIPMENT.
(b) Install the washer [11] and nut [10].
1) Tighten the nut [10] to 30-35 pound-inches (3.9-4.0 newton-meters).
(c) Install the bolt assembly [3], washer [7], and nut [6] to connect the rudder trim actuator [1]
to the rudder feel and centering unit [2].
1) Tighten the nut [6] to 85-100 pound-inches (9.6-11.3 newton-meters).
CAUTION: DO NOT TRY TO TIGHTEN THE NUT [6] AGAIN AFTER YOU TIGHTEN THE NUT [4],
YOU CAN CAUSE DAMAGE TO EQUIPMENT.
(d) Install the washer [5] and nut [4].
1) Tighten the nut [4] to 30-35 pound-inches (3.9-4.0 newton-meters).
(e) Connect the electrical connector [9] to the rudder trim actuator [1].
SUBTASK 27-21-87-860-005
(4) 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 27-21-87-860-006
(5) Do this task: Rudder Hydraulic System A, B, or Standby Pressurization,
TASK 27-21-00-800-801.
SUBTASK 27-21-87-860-007
(6) Remove the safety tags and close these circuit breakers:
F/O Electrical System Panel, P6-2
Row Col Number Name
D 16 C00788 FLIGHT CONTROL TRIM IND RUD
D 19 C00787 FLIGHT CONTROL TRIM CONT RUD
SUBTASK 27-21-87-820-001
(7) Operate the rudder trim knob until you can install the rig pin R-5 from the rig pin kit, SPL-1585 to
the rudder feel and centering unit [2].
SUBTASK 27-21-87-820-002
(8) If the rudder trim indicator reading is not 0.0 +/- 0.1 unit, turn the adjustment screw on the
bottom of the rudder trim indicator until the pointer reads 0.0 +/- 0.1 unit
Figure 27-11-94-990-801.
SUBTASK 27-21-87-480-001
(9) Remove the rig pin R-5 from the rudder feel and centering unit [2].
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SUBTASK 27-21-87-730-001
(10) Do this task: Rudder Travel Test, TASK 27-21-00-700-817-001 or Rudder Travel Test,
TASK 27-21-00-700-817-002.
SUBTASK 27-21-87-730-002
(11) Do this task: Rudder Trim System Test, TASK 27-21-00-700-819-001 or Rudder Trim System
Test, TASK 27-21-00-700-819-002.
F. Put the Airplane Back to Its Usual Condition
SUBTASK 27-21-87-860-008
(1) If it is necessary, 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 27-21-87-410-001
(2) Install this access panel:
Number Name/Location
324BL Vertical Fin, Trailing Edge Access
------------------------- END OF TASK ---------------------------
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MAIN RUDDER POWER CONTROL UNIT - REMOVAL/INSTALLATION
1. General
A. This procedure has these tasks:
(1) A removal of the main rudder power control unit (PCU)
(2) An installation of the main rudder PCU
(3) A removal of the main rudder PCU load limiter solenoid valve
(4) An installation of the main rudder PCU load limiter solenoid valve.
TASK 27-21-91-000-804-001
2. Main Rudder Power Control Unit Removal
(Figure 401, Figure 402)
A. References
Reference Title
27-21-00-800-802 Remove Pressure from the Rudder Hydraulic Systems A, B, and
Standby (P/B 201)
B. Tools/Equipment
NOTE: When more than one tool part number is listed under the same "Reference" number, the
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL飞机维护手册2(109)
