S 862-046
 (3)  
Supply electrical power (AMM 24-22-00/201).

 S 862-047

 (4)
Pressurize hydraulic systems No. 1 or No. 4 (AMM 29-11-00/201).

 S 792-066
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
 (5)  Extend and retract the flaps. Make sure that there are no hydraulic leaks.
 TASK 27-51-10-002-049
 10. Priority Valve Flow Control Cartridge Removal_____________________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control (Apply Power)

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (3)  
AMM 32-00-30/201, Landing Gear Door Locks

 B.
Access

 (1)  
Location Zone
 137 Body Landing Gear Well, LH
 138 Body Landing Gear Well, RH

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 C. Prepare for the Removal
 S 492-050
 (1) Make sure that the landing gear ground locks are installed.
 S 492-051
 WARNING: CAREFULLY DO THE SPECIFIED TASK TO INSTALL THE DOOR LOCKS ON
_______ THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  
Install the door locks on the doors for the body landing gear (AMM 32-00-30/201).

 S 862-052

 (3)  
Release the pressure in hydraulic systems No. 1 and No. 4 (AMM 29-11-00/201).

 S 862-053

 (4)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6, Main Power Distribution Panel
 1) 6L20, TE FLAP ELEC CONT INBD
 2) 6L19, TE FLAP ELEC CONT OTBD

 D.
Procedure (Fig. 201)

 S 022-054
 (1)  
Remove the priority valve:

 (a)  
Remove the priority valve flow control cartridge (25) from the flap control module (7).

 (b)  
Install the protective cap in the module port.

 TASK 27-51-10-402-055
 11. Priority Valve Flow Control Cartridge Installation__________________________________________________
 A. Consumable Materials
 (1)  
G00062, Fluid - Hydraulic, Fire Resistant, BMS 3-11

 (2)  
D00054, Lubricant - Assembly, Skydrol, MCS 352

 B.
Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 201 | 23 | O-ring | 27-51-09 | 01 | 155 | | | 24 | Backup Ring | | | 165 | 2......…........…...................................…...........….....…........1

 C.
References

 (1)  
AMM 12-12-01/301, Hydraulic Systems

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

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 ALL  ú ú 01 Page 215 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

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

 (4)  
AMM 32-00-30/201, Landing Gear Door Locks

 D.
Access

 (1)  
Location Zone
 137 Body Landing Gear Well, LH
 138 Body Landing Gear Well, RH

 E.
Procedure (Fig. 201)

 S 422-056
 (1)  
Install the priority valve:

 (a)  
Lubricate the backup rings (24) and O-rings (23) with the assembly lube or hydraulic fluid.
　
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