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 22-21-03
 ALL  ú ú 03 Page 405 ú Jun 10/93
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A
747-400 MAINTENANCE MANUAL
 YDS ELECTROHYDRAULIC SERVOVALVE AND SOLENOID VALVE -
____________________________________________________ MAINTENANCE PRACTICES
_____________________
 1.  General_______
 A.  This procedure contains three tasks. The first task is for the removal of the electrohydraulic servovalve (EHSV) or the solenoid valve from the rudder power control module (RPCM). The second task is for the installation of the EHSV or the solenoid valve on the RPCM. The third task is for the check of the installed EHSV or solenoid valve.
 B.  There are two RPCMs. Each RPCM has one EHSV and one solenoid valve. The procedure is the same for the EHSV and the solenoid valve.
 C.  You can find the upper RPCM and the lower RPCM between the rear spar and the trailing edge of the vertical stabilizer. You can get access to the upper RPCM through the 324UL/324UR access panel. You can get access to the lower RPCM through the 324DL/324DR access panel
 TASK 22-21-04-002-061
 2.  Valve Removal (Fig. 201)_____________
 A.  References
 (1)
AMM 06-09-07/201, Fin and Rudder Access Doors and Panels

 (2)
AMM 20-11-19/401, O-Rings

 (3)
AMM 20-11-28/401, Lockwire

 (4)
AMM 24-22-00/201, Manual Control

 (5)
AMM 29-11-00/201, Main Hydraulic Supply System

 B.  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

 C.  Procedure
 S 862-062
 (1) Supply electrical power (AMM 24-22-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 22-21-04
 ALL  ú ú 03 Page 201 ú Feb 18/01
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A

747-400 MAINTENANCE MANUAL
ENGAGE SOLENOID VALVE
ELECTROHYDRAULIC SERVO VALVE
RUDDER POWER CONTROL MODULE (EXAMPLE)

CYLINDER
RETURN
PRESSURE
ENGAGE SOLENOID VALVE ELECTROHYDRAULIC SERVO VALVE
YDS Electrohydraulic Servovalve and Solenoid Valve
Figure 201

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 22-21-04
 ALL  ú ú 01 Page 202 ú Feb 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 S 862-063
 (2)  Open these circuit breakers and attach 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 5) 7C13, FLT CONT ELEC 1L DC 6) 7C14, FLT CONT ELEC 1R AC 7) 7C15, FLT CONT ELEC 1R DC 8) 7C16, FLT CONT ELEC 2R AC 9) 7C17, FLT CONT ELEC 2R DC 10) 7C18, LWR YAW DAMPER 11) 7E07, STAB TRIM L S/O VALVE 12) 7E20, STAB TRIM R S/O VALVE
 (b)  P180, DC Power Distribution Panel 1) 180H08, ELEV/RUD VLV SYS 1 2) 180E07, ELEV/RUD VLV SYS 2 3) 180H23, ELEV/RUD VLV SYS 3 4) 180E22, ELEV/RUD VLV SYS 4
 S 862-064
 (3)  Remove the hydraulic pressure from the hydraulic systems No. 2 and No. 3 (AMM 29-11-00/201).
 S 862-065
 (4)  Set the STAB TRIM 2 and 3 switches on the Pilots' Control Stand to the CUTOUT position.
 S 862-066
 (5)  Set the FLT CONTROL HYD POWER TAIL 1, 2, 3, and 4 switches to the SHUTOFF position. These switches are on the Pilots' Overhead Maintenance Panel (P461).

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