(1)  
Make sure the seals are in good condition.

 (2)  
Put the rudder in its position.

 (3)  
Connect the hinges and the PCP's for the rudder.

 (4)  
Remove the support equipment for the upper rudder.

 (5)  
Install the lower rudder.

 TASK 27-21-01-004-129
 2.  Lower Rudder Removal (Fig. 401)____________________
 A.  Special Tools and Equipment
 (1)  ST2580-267 Spanner Wrench Adapter Set
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MAINTENANCE MANUAL

Rudder Sling Installation
Figure 401

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747-400
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 (2)  
G27010-1 Lower Rudder Sling Assembly

 (3)  
G12001-XX Rig pin NS-6

 B.
Standard Tools and Equipment

 (1)  
Crane

 (2)  
Load Positioner (For 310 Pounds minimum), 3734T51, McMaster-Carr

 P.O.
 Box 54960, Los Angeles, California 90054 (We recomend this tool, but it is optional)

 C.
References

 (1)  
09-11-00/201, Towing

 (2)  
24-22-00/201, Manual Control

 (3)  
29-11-00/201, Main Hydraulic Supply System

 (4)  
32-50-00/201, Steering

 (5)  
IPC 27-21-01 Fig. 2

 (6)  
IPC 27-21-16 Fig. 2

 (7)  
IPC 27-28-01 Fig. 1

 (8)  
IPC 55-40-52 Fig. 1

 D.
Access

 (1)  
Location Zone
 324 Vertical Fin, Rear Spar to Trailing Edge
 325 Rudder, Lower

 (2)  
Access Panel
 324BL Inspection Access Panel
 324CL Inspection Access Panel
 324DL Inspection Access Panel
 324EL Inspection Access Panel
 324FL Inspection Access Panel

 E.
Prepare for the Removal of the Lower Rudder

 S 494-002
 WARNING:_______MAKE SURE THE NOSE LANDING GEAR IS POINTED FORWARD. IF THE TIRES ARE NOT PARALLEL WITH THE AIRPLANE, THEY CAN TURN QUICKLY WHEN YOU REMOVE THE RIG PIN. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  Install the TOW PIN at the steering metering valve for the nose landing gear (Ref 09-11-00/201).
 NOTE: You do this to make sure the nose landing gear does not turn.
____
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747-400 MAINTENANCE MANUAL
 (2)  S 014-003Remove the access panels (on the verticle fin) for the lower rudder.
 (3)  S 864-004Supply electrical power (Ref 24-22-00/201).
 (4)  S 864-006Open these circuit breakers and attach DO-NOT-CLOSE tags: (a) P180, DC Power Distribution Panel 1) 180E7, ELEV/RUD VLV SYS 2 2) 180E22, ELEV/RUD VLV SYS 4
 (5)  S 864-009Find the switches for the FLT CONTROL HYD POWER on the Pilot's Overhead Maintenance Panel, P461. (a) Put the No. 2 and No. 4 TAIL switches in the SHUT OFF position.
 S 864-099

 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, 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.
 (6)  
Supply hydraulic power for hydraulic systems No. 1 and No. 3 (Ref 29-11-00/201).
　
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