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

 (3)  
SSM 27-51-01, SSM 27-51-02, SSM 27-51-03

 (4)  
WDM 27-51-11, WDM 27-51-21, WDM 27-51-22, WDM 34-12-61, WDM 34-12-62

 D.
Access

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

 E.
Procedure

 S 422-086
 (1)  
Install the bypass valve:

 (a)  
Lubricate the o-rings (6) and backup rings (5) with the assembly lube or hydraulic fluid.

 (b)  
Install the o-rings and backup rings in the bypass valve (4).

 (c)  
Remove the plug from the flap control module (7).

 (d)  
Install the bypass valve.

 NOTE: Install the bypass valve in the flap control module with
____ the electrical connector inboard.
 (e)  
Install the four screws (28) and washers (29) to attach the bypass valve.

 (f)  
Install the lockwire on the four screws.

 S 432-087
 (2)  
Install the bypass valve electrical connector (3)

 (a)  
DV138 (Inboard Flap By-Pass Valve)

 (b)  
DV139 (Outboard Flap By-Pass Valve)

 S 862-088
 (3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

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

 S 862-024
 (4)  
Supply electrical power (AMM 24-22-00/201).

 S 862-025

 (5)
Pressurize hydraulic systems No. 1 or No. 4 (AMM 29-11-00/201).

 (6)  
Do a check of the bypass valve operation:

 S 712-026
 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.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-51-10
 ALL  ú ú 01 Page 209 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (a)  
Extend and retract the flaps hydraulically.

 (b)  
Examine the bypass valve for hydraulic leaks.

 (c)  
Push the ALTN FLAPS ARM switch on the pilot's center panel to put the flap system in alternate control.

 (d)  
Make sure that the bypass valve manual override lever (27) moves to position 1.

 (e)  
Move the flap control lever and make sure that the flaps do not move.

 (f)  
Put the flap control lever in the UP detent.

 WARNING: THE TRAILING EDGE FLAPS WILL MOVE TO AGREE WITH THE
_______ CONTROL LEVER POSITION WHEN THE ALTERNATE CONTROL IS DISARMED. MAKE SURE THAT ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE TE AND LE FLAPS.
 (g)  
Push the ALTN FLAPS ARM switch to put the flaps in primary control.

 (h)  
Make sure that the bypass valve manual override lever (27) moves to position 2.

 TASK 27-51-10-002-027
 6. Flap Control Bypass Valve Motor Removal
_______________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

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

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

 (4)  
AIPC 27-51-09, Fig. 1 and No. 3

 B.
Access

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

 C.
Prepare for the Removal

 (1)
Make sure that the landing gear ground locks are installed.

 S 492-028
 S 492-029
 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)  
　
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