S 494-019

 (3)
Disconnect the hydraulic lines H1 and H2 from the actuator (4):

 (a)  
Put a bucket below the actuator to catch the hydraulic fluid.

 (b)  
Disconnect the hydraulic lines from the actuator.

 (c)  
Install caps on the hydraulic lines.

 S 024-022
 (4)  
Remove the upper actuator (4):

 (a)  
Remove the nut (16) and washer (15).

 (b)  
Remove the bolt assembly (11).

 (c)  
Use the fishpole hoist and the hoist frame equipment to hold the actuator (4).

 (d)  
Remove the four bolts (9) and washers (10) that connect the actuator (4) to the pillow block (3).

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747-400 MAINTENANCE MANUAL
 (e)  Retract the piston in the actuator (4).
 NOTE: Use the bucket to catch the hydraulic fluid.
____
 (f)  
Install the caps on the hydraulic ports.

 (g)  
Remove the actuator (4) through the opening in the right side of the vertical stabilizer.

 S 494-071
 (5)  
If you will not install the upper actuator immediately, do these steps to install the rudder actuator lock (referred to as the lock):

 (a)  
Put the lock in the location of the actuator that you removed.

 (b)  
Attach the lock to the pillow block (3) with its four bolts.

 (c)  
Adjust the length of the lock until you can connect it to the rudder with the pin.

 (d)  
Install the three lockpins in the lock.

 (e)  
Remove the rudder clamp from between the upper and lower rudders.

 TASK 27-21-16-404-024
 4.  Lower Rudder Upper Actuator Installation (Fig. 401)________________________________________
 A. Special Tools and Equipment
 (1)  
ST2580-267, Spanner Wrench Set

 (2)  
3ME65B81000-1, Rudder Clamp

 (3)  
G27008-19, Rudder Actuator Lock

 (4)  
G27016-39, Hoist Frame Equipment - Upper and Lower Rudder P.C.U.

 (5)  
Fishpole Hoist - P/N PF51-009-1 or Equivalent
 PF Industries
 Hoist Minilift
 Didsbury Engineering

 B.
Consumable Materials

 (1)  
A00181, Adhesive - BMS 5-92

 (2)  
A00247, Sealant - BMS 5-95

 (3)  
D00054, Lubricant - Skydrol Assembly Lube MCS352

 (4)  
D00153, Fluid, Hydraulic Fire Resistant - BMS 3-11

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 C. Parts ~.............................................................................. | AMM | | AIPC | ................. ...........................| | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ...............................................................................| | 401  |  4 | Actuator Upper | 27-21-16 | 02 | 295 | | | 9 | Bolt | | | 260 | | | 10 | Washer | | | 265 | | | 11 | Bolt Assy | | | 245 | | | 14 | Bushing | | | 240 | | | 15 | Washer | | | 250 | | | 16 | Nut | | | 255 | | | 35 | Wire Bundle Clamp | | | | | | | | | | | 2......…........…...................................…...........….....…........1
 D. References
 (1)  
AMM 27-21-16/501, Lower Rudder Power Control Actuator

 E.
Access

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

 F.
Procedure

 S 494-025
 (1)  
Do these steps to install the rudder clamp, and remove the rudder actuator lock (referred to as the lock):

 (a)  
Make sure the upper rudder is aligned with the lower rudder.
　
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