21-51-06
 ALL  ú ú 04 Page 404 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 FAN DIFFUSER AND INLET HOUSING - REMOVAL/INSTALLATION
_____________________________________________________
 1.  General_______
 A.  This procedure has instructions to remove and install the fan diffuser and inlet housing (fan housing). One fan housing is installed in each air cooling pack, aft of the air cycle machine.
 B.  The fan is part of the air cycle machine. To remove or install the fan, do the procedure to remove or install the air cycle machine (Ref 21-51-04/401).
 TASK 21-51-07-004-001
 2.  Fan Diffuser and Inlet Housing Removal (Fig. 401)______________________________________
 A.  References
 (1)  
06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
IPC 21-62-56 Fig. 1 and 2

 B.  Access
 (1)  
Location Zone
 133 Air Conditioning Equipment Bay, LH
 134 Air Conditioning Equipment Bay, RH

 (2)  
Access Panel
 191A-L Air Conditioning Access Door
 192A-R Air Conditioning Access Door
 191H-L Air Conditioning Access Door

 C.  Prepare for the Removal
 S 864-003
 (1)  Make sure the applicable (1, 2, or 3) PACKS selector, on the overhead panel, P5, is in the OFF position.
 (a)  Put a DO-NOT-OPERATE tag on the selector.
 S 014-004
 (2)  Open the applicable access door, (Ref 06-09-03/201):
 -191A-L for pack 1
 -191H-L for pack 2
 -192A-R for pack 3
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 21-51-07
 ALL  ú ú 01 Page 401 ú Jun 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

FWD
PACK 1 PACK 2
FAN DIFFUSER FAN DIFFUSER
AND INLET HOUSING
AND INLET HOUSING PACK 3 FAN DIFFUSERSEE A AND INLET HOUSING
AIR CONDITIONING EQUIPMENT BAY
FLEXIBLE SLEEVE
RAM AIR DUCT JOINT CLAMP ASSEMBLY
RAM AIR DUCT
HEAT EXCHANGER HEADER DUCT
SUPPORT ROD
(2 PLACES)
BOLT
FLEXIBLE SLEEVE
CLAMP
CLAMP ASSEMBLY BOLT
AIR CYCLE MACHINE 
FAN HOUSING  FAN DIFFUSER 
FAN DIFFUSER AND  AND INLET HOUSING 
INLET HOUSING CLAMP 
SUPPORT ROD 
PACK 1 (TYPICAL)  (2 PLACES) 

A
Fan Diffuser and Inlet Housing Installation
Figure 401

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747-400 MAINTENANCE MANUAL
 D. Remove the Housing
 S 034-005
 (1)  Disconnect the housing from the ram-air duct.
 (a)  
Remove the bolts from the support rods on the clamp.

 (b)  
Disconnect the support rods from the clamp.

 (c)  
Remove the clamp from the duct joint.

 (d)  
Move the flexible sleeve away from the housing.

 S 034-008
 (2)  Disconnect the housing from the heat exchanger.
 (a)  
Remove the bolts from the support rods on the clamp.

 (b)  
Disconnect the support rods from the clamp.

 (c)  
Remove the clamp from the duct joint.

 (d)  
Move the flexible duct away from the housing.

 S 034-011
 (3)  
Remove the clamp that is between the housing and the air cycle machine.

 S 024-012

 (4)  
Remove the housing from the air cooling pack.

 S 024-035

 (5)  
If it is necessary, remove the ram air system screen from the inlet housing for re-installation on the new inlet housing (AMM 21-51-15/401).

 NOTE: If you do not remove the screen from the old inlet housing,
____ you will need to get/install a new screen, since the new inlet housing will not have one.
　
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