S 415-026

 (12)
 Close the access panel 324FL.

 S 865-027

 (13)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7D16, RUD TRIM CONT

 (b)  
P180, DC Power Distribution Panel
 1) 180H8, ELEV/RUD VLV SYS 1
 2) 180E7, ELEV/RUD VLV SYS 2
 3) 180H23, ELEV/RUD VLV SYS 3
 4) 180E22, ELEV/RUD VLV SYS 4

 S 865-028
 (14)
 Set the FLT CONTROL HYD POWER TAIL switches on the P461, Pilots' Overhead Maintenance Panel to NORM.

 S 865-029

 (15)
 If the electrical power is not necessary, do this task:  "Remove Electrical Power" (AMM 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 RUDDER POSITION TRANSMITTER - REMOVAL/INSTALLATION
__________________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. There is one task for the removal and one task for the installation of the rudder position transmitter. The procedure has these parts:
 (1)  
The removal of the rudder position transmitter

 (2)  
The installation of the replacement transmitter

 (3)  
The adjustment of the transmitter.

 B.  
The removal and installation procedure is the same for the upper or the lower rudder position transmitter.

 TASK 27-28-01-004-001
 2.  Rudder Position Transmitter Removal (Fig. 401)___________________________________
 A.  Special Tools and Equipment
 (1)  
G12001-50, Rig Pin Kit

 B.  
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AIPC 27-28-01, Fig. 1

 (3)  
SSM 27-28-01

 (4)  
WDM 27-28-11

 C.  
Access

 (1)  
Location Zone 324 Vertical Stabilizer Rear Spar to Trailing Edge

 (2)  
Access Panel 324FL Rudder Components Inspection Access Panel

 D.  
Remove the Rudder Position Transmitter

 (1)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 864-003

 (2)  
Set all FLT CONTROL HYD POWER TAIL switches on the P461 Pilots' Overhead Maintenance Panel to SHUTOFF.

 (a)
Make sure that the four VALVE CLOSED lights come on.

 S 864-002
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A

747-400
MAINTENANCE MANUAL

UPPER RUDDER FRONT SPAR
SEE A
SEE D
BRACKET
BONDING JUMPER ELECTRICAL CONNECTOR
CRANK CONTROL ROD SEE CUPPER RUDDER POSITION TRANSMITTER
LOWER RUDDER POSITION TRANSMITTER
SEE B LOWER RUDDER FRONT SPAR
B

INDEX MARKS  OUTER RIG PIN HOLE  A 
INNER RIG PIN HOLE 
TRANSMITTER CLAMPING SCREWS  0.26-0.32 INCH 
TRANSMITTER BRACKET  RIG PIN SLOT  KNURLED THUMBNUT 
6.15 INCH 
CRANK 
D  SHAFT CLAMPING SCREW  C 

Rudder Position Transmitter Installation
Figure 401

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A
747-400 MAINTENANCE MANUAL
 (3)  S 864-004Open these circuit breakers and attach DO-NOT-CLOSE tags: (a) P180, DC Power Distribution Panel 1) 180H8, ELEV/RUD VLV SYS 1 2) 180E7, ELEV/RUD VLV SYS 2 3) 180H23, ELEV/RUD VLV SYS 3 4) 180E22, ELEV/RUD VLV SYS 4 (b) P6, Main Power Distribution Panel 1) 6J25, RUD/ELEV IND 2) 6J24, RUD/ELEV SENSOR
　
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