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A
747-400 MAINTENANCE MANUAL
 S 012-067
 (6) Remove the applicable access panel(s)(AMM 06-09-07/201).
 NOTE: The 324UL/324UR access panel is for the upper RPCM.
____ The 324DL/324DR access panel is for the lower RPCM.
 S 022-068
 (7)  Do these steps to remove the valve:
 (a)  
Remove the lockwire from the mounting screws (AMM 20-11-28/401).

 (b)  
Remove the mounting screws.

 (c)  
Remove the valve.

 (d)  
Remove the seal plate.

 (e)  
Remove the O-ring from the valve (AMM 20-11-19/401).

 (f)  
Put a cover on the RPCM opening.

 TASK 22-21-04-402-069
 3. Valve Installation (Fig. 201)
__________________
 A. Standard Tools and Equipment
 (1)  
Bonding Meter - Autron T477W

 (2)  
O-ring Installation Tool - ST848

 (3)  
Torque Wrench - Commercially available

 B. Consumable Materials
 (1)  
D00153 Fluid Hydraulic - BMS 3-11, Type IV, Class 1

 (2)  
D00288 Lubricant - MCS 352

 C. References
 (1)  
AMM 20-11-19/401, O-Rings

 (2)  
AMM 20-11-28/401, Lockwire

 (3)  
AMM 20-22-01/601, Electrical Bonding

 D. Access
 (1)  
Location Zone 324 Vertical Stabilizer Between Rear Spar and Trailing Edge

 (2)  
Access Panel
 324UL Access Panel
 324UR Access Panel
 324DL Access Panel
 324DR Access Panel

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 E. Procedure
 S 422-070
 (1)  Do these steps to install the valve:
 (a)  
Remove the cover from the RPCM opening.

 (b)  
Clean the seal plate.

 (c)  
Make sure the O-ring is satisfactory.

 (d)  
Replace the O-ring if it is necessary.

 (e)  
Lubricate the O-ring with hydraulic fluid.

 (f)  
Install the O-ring on the valve with the O-ring installation tool (AMM 20-11-19/401).

 (g)  
Put the seal plate in the correct position.

 (h)  
Hold the valve in position and install the mounting screws.

 (i)  
Tighten the mounting screws between 50-70 pound-inches.

 (j)  
Use the bonding meter to read the resistance value between the valve and the RPCM body. Make sure the resistance value is less than 5.0 milliohms (AMM 20-22-01/601).

 (k)  
Install the lockwire (AMM 20-11-28/401).

 TASK 22-21-04-702-071
 4.  Valve Test___________
 A. References
 (1)  
AMM 06-09-07/201, Fin and Rudder Access Doors and Panels

 (2)  
AMM 22-21-00/501, Yaw Damper System

 B. Access
 (1)  
Location Zone 221 Control Cabin, LH 222 Control Cabin, RH 324 Vertical Stabilizer Between Rear Spar and Trailing Edge

 (2)  
Access Panel
 324UL Access Panel
 324UR Access Panel
 324DL Access Panel
 324DR Access Panel

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 C. Procedure
 S 862-072
 (1) Close these circuit breakers and remove the DO-NOT-CLOSE tags:
 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7C09, UPR YAW DAMPER
 2) 7C10, FLT CONT ELEC 2L AC
 3) 7C11, FLT CONT ELEC 2L DC
 4) 7C12, FLT CONT ELEC 1L AC
　
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