(a)  
Lubricate the new packings and the threads of the fittings with hydraulic fluid.

 (b)  
Install the packings and the fittings in the return module.

 (c)  
Clean the module mounting surfaces for the electrical bond (AMM 20-22-01/601).

 (d)  
Put the return module on the mounting bracket.

 (e)  
Install the four mounting bolts.
 1) Tighten the bolts.
 2) Install lockwires on the bolts.

 (f)  
Install the retainer clamp on the module.

 (g)  
Connect the two hydraulic tubes to the module.

 S 862-016
 (2)  
Pressurize the hydraulic system (AMM 29-11-00/201).

 S 792-017

 (3)  
Examine the return module for leakage.

 (a)  
If you find leakage, repair the cause of it.

 S 862-018
 (4)  Release the pressure in the hydraulic system if it is not necessary for other operations (AMM 29-11-00/201).
 S 412-020
 CAUTION: MAKE SURE YOU LATCH THE FAIRING DOORS ON THE TRAILING EDGE
_______ CORRECTLY. DAMAGE CAN OCCUR IF THE DOORS OPEN DURING A FLIGHT.
 (5)  On systems 1 and 4, close the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).
 TASK 29-11-29-002-021
 4. Return Filter Element Removal (Fig. 201)
_____________________________
 A. References
 (1)  AMM 09-11-00/201, Towing and Taxiing
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-29
 ALL  ú ú 03 Page 204 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

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

 (3)  
IPC 29-11-29 Fig. 1, 5, and 51

 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 012-022
 (1)  
On hydraulic systems 1 and 4, open the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).

 S 492-023

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

 S 862-024
 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 022-083

 (4)  
Remove the return filter element:

 (a)  
Remove the retainer clamp from the module.

 CAUTION: DO NOT PRESSURIZE THE HYDRAULIC SYSTEM WHILE THE FILTER IS
_______ REMOVED. THIS CAN CAUSE DAMAGE TO THE MODULE OR THE CHECK VALVE.
 (b)  Remove the filter case and the filter element. 1) Discard the packings and the filter element.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-29
 ALL  ú ú 03 Page 205 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 TASK 29-11-29-402-027
 5.  Return Filter Element Installation (Fig. 201)__________________________________
 A. Consumable Materials
 (1)  
D00153 Fluid - Hydraulic, Fire-Resistant BMS 3-11

 B.
References

 (1)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (2)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 (3)  
IPC 29-11-29 Fig. 1, 5, and 51

 C.
Access

 (1)  
Location Zone
 454 System 1 - Strut Aft Fairing
　
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