S 862-008

 (8)  
Set the FLT CONTROL HYD POWER TAIL switches on the P461 Pilot's Overhead Maintenance Panel in SHUTOFF.

 S 862-010

 (9)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P180 DC Power Distribution Panel
 1) 180E7 ELEV/RUD VLV SYS 2

 S 862-007
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747-400 MAINTENANCE MANUAL
 2) 180E22 ELEV/RUD VLV SYS 4
 3) 180H8 ELEV/RUD VLV SYS 1
 4) 180H23 ELEV/RUD VLV SYS 3

 S 012-011
 (10)
 Open the access panel 324FL (Ref 06-09-07/201).

 S 012-072

 (11)
 Open the access door 315A (Ref 06-09-06/201).

 S 492-012

 (12)
 Install rig pin R-4 in the rudder feel, centering, and trim mechanism.

 S 492-075

 (13)
 Install the rig pin E-2 in the elevator aft torque tube.

 S 012-013

 (14)
 Remove the access panels 324UL and 324UR, or 324DR and 324DL (Ref 06-09-07/201).

 E.
Remove the Power Control Module

 S 032-014
 (1)  
Disconnect the electrical connector, DM8004, from the upper PCM, or the electrical connector, DM8005, from the lower PCM.

 S 492-066

 (2)  
Put a bucket below the PCM to catch all hydraulic fluid.

 S 022-015

 (3)  
Remove the rudder PCM (3 or 5):

 (a)  
Disconnect the hydraulic lines from the rudder PCM. 1) Make sure you seal all the hoses with caps.

 (b)  
Remove the bolt (27) to disconnect the input control rod from the rudder PCM.

 NOTE: Make sure you do not change the length of the input
____
 control rod.

 (c)  Make sure the input control rod is clear of the rudder PCM.
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MAINTENANCE MANUAL

SEE A
1. UPPER ACTUATOR FOR THE UPPER RUDDER FRONT SPAR
2.
 CENTER ACTUATOR FOR THE UPPER RUDDER

3.
 POWER CONTROL

10. RATIO CHANGER FOR
MODULE FOR THE
THE UPPER RUDDER
UPPER RUDDER
INPUT CONTROL ROD
9. LOWER ACTUATOR FOR
THE UPPER RUDDER

27.
 BOLT

28.
 WASHER

29.
 WASHER

30.
 NUT

INPUT CONTROL ROD
4. FEEL, CENTERING AND TRIM MECHANISM
33. JUMPER RB CABLE RA CABLE FRONT SPAR8. UPPER ACTUATOR FOR
THE LOWER RUDDER
5. POWER CONTROL
INPUT CONTROL ROD  MODULE FOR THE LOWER RUDDER
6.
 LOWER ACTUATOR

7.
 RATIO CHANGER

FOR THE LOWER RUDDER FOR THE RUDDER
27.
 BOLT

28.
 WASHER

29.
 WASHER

30.
 NUT

INPUT
CONTROL
ROD
A
Upper and Lower Rudder Power Control Module Figure 201 (Sheet 1)
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747-400
MAINTENANCE MANUAL

11. WASHER
31. ELECTRO-HYDRAULIC 12. BOLT SERVO VALVE (2 LOCATIONS)
13. BUSHING
15. BACKUP RING
17. BACKUP RING
16. FILTER
18. O-RING
17. BACKUP RING
26. O-RING  19. FILTER CAP 
3. POWER CONTROL  24. BACKUP RING 
MODULE FOR THE  20. FILTER CAP 
UPPER RUDDER  25. O-RING  23. FILTER 
20. FILTER CAP  24. BACKUP RING 
　
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