CAUTION:_______INSTALL A NEW WASHER (12) AT ALL FOUR BOLTS (11). IF YOU TIGHTEN A BOLT AND THEN LOOSEN IT, YOU MUST REPLACE THE WASHER. THE TORQUE ON THE BOLTS CAN BE INCORRECT IF YOU INSTALL USED WASHERS.

 (d)  
Install the new torque indication washers (12) with the countersink to the head of the bolt (11).

 (e)  
Install the four bolts (11).

 (f)  
Tighten the bolts (11) until you cannot turn the center of the torque indication washers (12) by hand.

 (g)  
Remove the caps from the hydraulic ports.

 (h)  
Put the rod end of the lower actuator (7) in its position in the upper rudder attachment fitting (42).

 (i)  
Make sure that the bushing (45) is installed in the attachment fitting.

 (j)  
Install the bolt (40) and washer (41) in the rod end.

 (k)  
Install the washer (43) and the nut (44) on the bolt (40).

 (l)  
Tighten the nut (44) to 800-1000 pound-inches more than the run-on torque.

 S 394-046
 (5)  
Fill the bolt holes in the trunnion (8) forward of the bolts (11) with sealant.

 S 434-047

 (6)  
Connect the hydraulic lines H5 and H6 to the lower actuator (7):

 (a)  
Remove the caps from the hydraulic lines.

 (b)  
Apply a layer of the hydraulic fluid or assembly lube to the hydraulic fittings.

 (c)  
Connect the hydraulic lines H5 and H6.

 (7)  
Do the task to put the airplane back to its usual condition.

 S 864-050
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 27-21-15
 ALL  ú ú 02 Page 421 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 714-053
 (8)  Do the operational test of the upper rudder PCU (AMM 27-21-15/501).
 TASK 27-21-15-844-078
 9.  Put the Airplane Back to Its Usual Condition____________________________________________
 A. Special Tools and Equipment
 (1)  
2MIT65B04011-41 Safety - Nose Gear Rig and Tow Pin

 (2)  
3ME65B81000-1, Rudder Holding Clamp

 B.
References

 (1)  
AMM 09-11-00/201, Towing

 (2)  
AMM 24-22-00/201, Manual Control

 C.
Access

 (1)  
Location Zone
 324 Vertical Fin, Rear Spar to Trailing Edge
 326 Upper Rudder

 (2)  
Access Panel
 324DL Inspection Access Panel
 324DR Rudder Actuator Access Panel
 324HL Inspection Access Panel
 324HR Centering Mechanism Access Panel
 324UL Inspection Access Panel
 324UR Inspection Access Panel

 D.
Procedure

 S 094-080
 (1)  
Remove the holding clamp from the trailing edge of the upper and lower rudder.

 (2)  
Remove the lock and release the left rudder pedal.

 (3)  
Remove the electrical power (AMM 24-22-00/201).

 S 094-081
 S 864-082
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 ALL  ú ú 01 Page 422 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-083
 (4)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7B11, UPR RUD RATIO AC PWR
 2) 7B12, UPR RUD RATIO CONT
 3) 7B13, UPR RUD RATIO DC PWR
 4) 7B14, LWR RUD RATIO AC PWR
 5) 7B15, LWR RUD RATIO CONT
 6) 7B16, LWR RUD RATIO DC PWR
 7) 7D16, RUD TRIM CONT

 (b)  
P180, DC Power Distribution Panel
 1) 180E7, ELEV/RUD VLV SYS 2
 2) 180E22, ELEV/RUD VLV SYS 4
 3) 180H8, ELEV/RUD VLV SYS 1
 4) 180E23, ELEV/RUD VLV SYS 3

 S 414-084
 (5)  
Close the applicable access panels.
　
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