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Figure 502 (Sheet 4 of 7)/27-21-00-990-811-001
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN 001-005, 155-157, 201-999 PRE SB 737-27-1253 27-21-00
Config 1
Page 527
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
Rudder Control System Aft Components
Figure 502 (Sheet 5 of 7)/27-21-00-990-811-001
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN 001-005, 155-157, 201-999 PRE SB 737-27-1253 27-21-00
Config 1
Page 528
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
Rudder Control System Aft Components
Figure 502 (Sheet 6 of 7)/27-21-00-990-811-001
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN 001-005, 155-157, 201-999 PRE SB 737-27-1253 27-21-00
Config 1
Page 529
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
Rudder Control System Aft Components
Figure 502 (Sheet 7 of 7)/27-21-00-990-811-001
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN 001-005, 155-157, 201-999 PRE SB 737-27-1253 27-21-00
Config 1
Page 530
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
TASK 27-21-00-820-810-001
6. Control Rod for Standby Rudder Power Control Unit Adjustment
(Figure 502)
A. General
(1) Use this task to adjust the control rod for the standby rudder power control unit (PCU). The
rudder main PCU must be adjusted before you adjust the standby rudder PCU.
B. References
Reference Title
24-22-00-860-811 Supply Electrical Power (P/B 201)
27-21-00-800-801 Rudder Hydraulic System A, B, or Standby Pressurization (P/B 201)
27-21-00-840-801 Put the Rudder Hydraulic systems A, B, and Standby Back to the
Condition Before the Pressurization (P/B 201)
C. Location Zones
Zone Area
211 Flight Compartment - Left
212 Flight Compartment - Right
324 Vertical Fin - Rear Spar To Trailing Edge
D. Access Panels
Number Name/Location
324CL Vertical Fin, Access
324DL Trailing Edge Access
E. Prepare for the Adjustment
SUBTASK 27-21-00-860-084-001
(1) Do this task: Supply Electrical Power, TASK 24-22-00-860-811.
SUBTASK 27-21-00-010-028-001
(2) To get access to the standby rudder PCU, do this step:
Open this access panel:
Number Name/Location
324DL Trailing Edge Access
SUBTASK 27-21-00-010-029-001
(3) To get access to the rudder feel and centering unit, do this step:
Open this access panel:
Number Name/Location
324CL Vertical Fin, Access
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN 001-005, 155-157, 201-999 PRE SB 737-27-1253 27-21-00
Config 1
Page 531
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
SUBTASK 27-21-00-860-085-001
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDER,
ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN
MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY
TO PERSONS AND DAMAGE TO EQUIPMENT.
(4) Pressurize the standby rudder hydraulic system. To pressurize it, do this task: Rudder
Hydraulic System A, B, or Standby Pressurization, TASK 27-21-00-800-801.
SUBTASK 27-21-00-860-086-001
(5) Move the rudder pedals through ten cycles to flush and bleed the standby rudder PCU.
SUBTASK 27-21-00-860-087-001
(6) Set the FLT CONTROL A and B switches to the ON position.
SUBTASK 27-21-00-860-088-001
(7) Make sure the rudder trim indicator is in the neutral position. (Figure 501)
SUBTASK 27-21-00-480-021-001
(8) Make sure you can install and remove the rig pin R-5 freely with no movement of the rudder feel
and centering unit output crank.(Figure 502)
F. Control Rod of the Standby Rudder PCU Adjustment
SUBTASK 27-21-00-710-073-001
(1) Adjust the control rod [34] of the standby rudder PCU:
(a) Set FLT CONTROL A and B switches to the STBY RUD position.
(b) Set the YAW DAMPER switch on the P5-3 overhead panel to the ON position.
1) Make sure the YAW DAMPER light goes out after approximately 2 seconds.
(c) Move the control wheel approximately 30 degrees clockwise.
1) Make sure the rudder moves to the right.
(d) Release the control wheel.
(e) Do these steps to initiate a zero yaw damper command output from the stall Management
Yaw Damper No. 2 (SMYD No. 2), M1748:
　
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