29-21-02
 ALL  ú ú 01 Page 304 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 AUXILIARY PUMP CASE DRAIN FILTER - REMOVAL/INSTALLATION
_______________________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task removes the auxiliary pump case drain filter (referred to as the filter). The second task installs the filter.
 B.  A filter is installed aft of the reservoir in the No. 1 and No. 4 engine struts. It is necessary to open the doors in the trailing edge fairing to get access to the filter.
 TASK 29-21-02-004-001
 2.  Auxiliary Pump Case Drain Filter Removal (Fig. 401)________________________________________
 A.  References
 (1)  
AMM 29-11-00/201, Main Hydraulic Supply System

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

 B.  
Access

 (1)  
Location Zone
 454 Engine 1 - Strut Trailing Edge Fairing
 484 Engine 4 - Strut Trailing Edge Fairing

 (2)  
Access Panel
 454A Trailing Edge Fairing Doors - Engine 1
 484A Trailing Edge Fairing Doors - Engine 4

 C.  
Procedure

 S 014-002
 (1)
Open the doors in the trailing edge fairing (AMM 54-62-00/201).

 (2)
Release the pressure in the hydraulic system (AMM 29-11-00/201).

 S 034-004

 (3)  
Disconnect the hose from the IN port of the filter and the tube from the OUT port.

 S 034-005

 (4)  
Install caps on the open tube, the hose, and the ports on the filter.

 S 034-016

 (5)  
Remove the bolts, washers, radius filler, and nuts which attach the filter to the bracket.

 S 864-003
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 29-21-02
 ALL  ú ú 01 Page 401 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

FWD 
SEE  A 
MOUNT BOLT WASHER (2) RADIUS FILLER NUT  A  MOUNT BRACKET  CASE DRAIN MODULE 
A 
AC PUMP CASE DRAIN FILTER  FWD  INLET 
A 

Case Drain Filter
Figure 401

ENGINE
NACELLE
STRUT

FILTER HEAD OUTLET ELEMENT O-RING BOWL O-RING
FILTER ELEMENT
FILTER BOWL
A-A
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 29-21-02
 ALL  ú
 ú  01  Page 402
 ú  Jun 10/88 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 024-017
 (6)  Remove the filter from the bracket.
 TASK 29-21-02-404-007
 3. Auxiliary Pump Case Drain Filter Installation (Fig. 401)
_____________________________________________
 A. References
 (1)  
AMM 29-11-00/201, Main Hydraulic Supply System

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

 (3)  
AMM 54-62-02/501, Nacelle Strut Access Doors

 B.
Access

 (1)  
Location Zone
 454 Engine 1 - Strut Trailing Edge Fairing
 484 Engine 4 - Strut Trailing Edge Fairing

 (2)  
Access Panel
 454A Trailing Edge Fairing Doors - Engine 1
 484A Trailing Edge Fairing Doors - Engine 4

 C.
Procedure

 S 424-018
 (1)  Put the filter in its position on the bracket.
 NOTE: Make sure the flow arrows on the filter head and the bracket
____
 point in the same direction.

 S 424-008
　
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