B.  
Access

 (1)  
Location Zone
 454 System 1 - Strut Aft Fairing
 735 System 2 - Wing Landing Gear Wheel Well
 745 System 3 - Wing Landing Gear Wheel Well
 484 System 4 - Strut Aft Fairing

 (2)  
Access Panel
 454AL Trailing Edge Fairing Doors - System 1
 484AL Trailing Edge Fairing Doors - System 4

 C.  
Procedure

 S 012-002
 (1)  
On hydraulic systems 1 and 4, open the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).

 S 492-003

 (2)  
On hydraulic systems 2 and 3, make sure the ground lockpins for the body gear are installed (AMM 09-11-00/201).

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A
747-400
MAINTENANCE MANUAL

D GROUND SERVICE DISCONNECT FOR THE RETURN MODULE  A B B RELIEF AND DIFFERENTIAL PRESSURE VALVE  C C  SEE DIFFERENTIAL PRESSURE INDICATOR  A  RETURN MODULE  SEE  A 
D  A  WASHER (QTY 2) NUT (4 LOCATIONS) BOLT CLAMP RETAINER  RETURN CASE FILTER ELEMENT FILTER PACKING (UPPER)  FILTER ELEMENT) (FOR PACKING CASE) PACKING (FOR FILTER
A 
SCREW (3 LOCATIONS)  RELIEF AND PRESSURE DIFFERENTIAL VALVE PACKING PACKING  DIFFERENTIAL PRESSURE INDICATOR  SCREW (4 LOCATIONS)  A-A  BACKUP RING PACKING PACKING 
BACKUP RING 
PACKING  PACKING 
B-B  C-C  D-D 
Return Module Installation Figure 201 

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A
747-400 MAINTENANCE MANUAL
 S 862-004
 WARNING: MAKE SURE YOU RELEASE THE HYDRAULIC SYSTEM PRESSURE BEFORE YOU
_______ OPEN THE HYDRAULIC SYSTEM. HYDRAULIC FLUID THAT HAS PRESSURE CAN CAUSE INJURY TO PERSONS.
 (3)
Release the pressure in the hydraulic system (AMM 29-11-00/201).

 S 022-081

 (4)  
Remove the return module:

 (a)  
Disconnect the two tubes from the module.

 (b)  
Install caps on all the open tubes and the module ports to prevent contamination.

 (c)  
Remove the retainer clamp from the module.

 (d)  
Remove the four mounting bolts.

 (e)  
Remove the return module from the mounting bracket.

 (f)  
Remove the fittings from the IN port, the OUT port, and the T(SERVICE) port. 1) Discard all the packings.

 TASK 29-11-29-402-010
 3. Return Module Installation (Fig. 201)
__________________________
 A. Consumable Materials
 (1)  
D00153 Fluid - Hydraulic, Fire Resistant BMS 3-11

 B.
References

 (1)  
AMM 20-22-01/601, Electrical Bonds and Grounds

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

 (3)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 (4)  
IPC 29-11-29 Fig. 1, 5, and 51

 C.
Access

 (1)  
Location Zone
 454 System 1 - Strut Aft Fairing
 735 System 2 - Wing Landing Gear Wheel Well
 745 System 3 - Wing Landing Gear Wheel Well
 484 System 4 - Strut Aft Fairing

 (2)  
Access Panel 454AL Trailing Edge Fairing Doors - System 1 484AL Trailing Edge Fairing Doors - System 4

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A
747-400 MAINTENANCE MANUAL
 D. Procedure
　
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