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3. Standby Rudder Power Control Unit Installation
(Figure 401)
A. References
Reference Title
12-12-00-610-801 Hydraulic Reservoir Servicing (P/B 301)
27-21-00-700-817-001 Rudder Travel Test (P/B 501)
27-21-00-700-817-002 Rudder Travel Test (P/B 501)
27-21-00-700-818-001 Standby Rudder Power Control Unit Deadband Test (P/B 501)
27-21-00-700-818-002 Standby Rudder Power Control Unit Deadband Test (P/B 501)
27-21-00-820-810-001 Control Rod for Standby 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)
B. Tools/Equipment
Reference Description
STD-203 Container - Oil Resistant, 1 U.S.-Gal (3.8 l)
C. Consumable Materials
Reference Description Specification
D00153 Fluid - Hydraulic, Erosion Arresting, Fire Resistant BMS3-11, Type
IV
(interchange~
able&
intermixable
with Type V)
D. Expendables/Parts
AMM Item Description AIPC Reference AIPC Effectivity
4 Power control unit 27-21-24-01-125 GUN ALL
E. Location Zones
Zone Area
324 Vertical Fin - Rear Spar To Trailing Edge
F. Access Panels
Number Name/Location
324DL Trailing Edge Access
G. Standby Rudder PCU Installation
SUBTASK 27-21-24-220-001
(1) Examine the standby rudder PCU and all connections to the standby rudder PCU for worn areas.
Do this task: Standby Rudder Power Control Unit Inspection (AMM 27-21-24/601).
SUBTASK 27-21-24-420-001
(2) If it the unions and packings are not installed in the power control unit [4], then do these steps:
(a) Lubricate the unions and packings with fluid, D00153.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-21-24
Page 405
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D633A101-GUN
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(b) Install the union [2] and new packing [3] in the power control unit [4].
(c) Install the union [10] and new packing [11] in the power control unit [4].
SUBTASK 27-21-24-420-002
(3) Install the power control unit [4]:
(a) Put the power control unit [4] in its position.
(b) Install the bolt [13], washers [14], bushing [15], bushing [16], washer [17], washer [18], and
nut [19] to connect the power control unit [4] to the airplane structure.
1) Tighten the nut [19] to 450-550 pound-inches (50.8-62.1 newton-meters).
(c) Install the bolt [20], washer [21], bushing [22], washer [23], and nut [24] to connect the
power control unit [4] to the rudder.
1) Tighten the nut [24] to 350-400 pound-inches (39.5-45.2 newton-meters).
SUBTASK 27-21-24-420-003
(4) Connect the vernier control rod [9] to the power control unit [4]:
(a) Install the bolt [5], washer [6], washer [7], and nut [8] to connect the control rod [9] to the
power control unit [4].
SUBTASK 27-21-24-020-005
CAUTION: MAKE SURE THAT YOU CORRECTLY INSTALL THE HYDRAULIC LINES TO THE
STANDBY RUDDER PCU. MAKE SURE THAT CORRECT UNIONS ARE INSTALLED IN
THE HYDRAULIC PORTS. YOU CAN CAUSE DAMAGE TO THE STANDBY RUDDER
PCU.
(5) Connect the hydraulic lines [12] to the power control unit [4]:
(a) Remove the caps and plugs from the hydraulic lines and ports.
(b) Remove the identification tags from the hydraulic lines.
(c) Remove the 1 U.S.-gal (3.81 l) oil resistant container, STD-203 used to catch fluids from the
hydraulic lines.
(d) Connect the hydraulic lines [12] to the power control unit [4].
SUBTASK 27-21-24-020-006
(6) Connect the electrical connector [1] to the power control unit [4].
SUBTASK 27-21-24-860-003
(7) 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 27-21-24-820-001
(8) Do this task: Control Rod for Standby Rudder Power Control Unit Adjustment,
TASK 27-21-00-820-810-001 or Control Rod for Standby Rudder Power Control Unit
Adjustment, TASK 27-21-00-820-810-002.
SUBTASK 27-21-24-860-004
(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.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-21-24
Page 406
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
SUBTASK 27-21-24-710-001
(10) Do this task: Standby Rudder Power Control Unit Deadband Test, TASK 27-21-00-700-818-001
　
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