(2)  
AIPC 21-26-08, Fig. 1

 (3)  
WDM 21-27-22

 (4)  
SSM 21-27-02

 B.  Access
 (1)  Location Zone
 145 Bulk Cargo Compartment, LH

 C.  Remove the Bulk Cargo Fan Screen
 S 862-002
 (1)  
Make sure that the AFT CARGO HT switch on the P5 overhead panel is set to off.

 S 862-003

 (2)  
Open the circuit breaker on the Power distribution center-right, P415:

 (a)  415H38, BULK CARGO VENT FAN PWR
 S 012-005
 (3)  
Remove the sidewall lining from the area immediately forward of the flapper valve screen in the aft left corner of the bulk cargo compartment (AMM 25-55-02/401).

 S 032-009

 (4)  
Remove the clamp holding the bulk cargo fan screen.

 D.  Clean the Bulk Cargo Fan Screen
 S 142-031
 (1)  
Use a cloth with clean water to rinse the screen and the inside of the check valve.

 S 142-032

 (2)  
Use a cloth or compressed air to dry the screen and the inside of check valve.

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A

747-400
MAINTENANCE MANUAL

SEE A
(REF) FAN BULK CARGO 
FAN SCREEN BULK CARGO  CLAMP BULK CARGO FAN SCREEN 
FWD 
A 

Bulk Cargo Fan Screen Cleaning
Figure 201

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H77371
A
747-400 MAINTENANCE MANUAL
 E. Install the Bulk Cargo Fan Screen
 S 432-017
 (1)  
Install the fan screen on the end of the fan.

 S 432-019

 (2)  
Install the clamp on the fan screen.

 S 862-022

 (3)  
Close the circuit breaker on the Power Distribution panel center-right, P415:

 (a)  415H38, BULK CARGO VENT FAN PWR
 S 862-023
 (4)  
Apply electrical power (AMM 24-22-00/201).

 S 412-028

 (5)  
Install the sidewall lining (AMM 25-55-02/401).

 (6)  
Remove electrical power (AMM 24-22-00/201).

 S 862-030
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 BULK CARGO FAN - REMOVAL/INSTALLATION
_____________________________________
 1.  General_______
 A.  To get access to the bulk cargo fan you must remove the sidewall lining from the left side of the bulk cargo compartment.
 TASK 21-26-08-004-042
 2.  Bulk Cargo Fan Removal (Fig. 401)______________________
 A.  References
 (1)  
AMM 25-55-02/401, Bulk Compartment Ceiling and Sidewall Lining

 (2)  
IPC 21-40-51 Fig. 1

 (3)  
WDM 21-27-22

 (4)  
SSM 21-27-03

 B.  Access
 (1)  Location Zone
 145 Bulk Cargo Compartment, LH

 C.  Prepare for the Removal
 S 864-031
 (1)  
Make sure that the AFT CARGO VENT switch on the P59 panel just forward of the cargo door is set to OFF.

 S 864-032

 (2)
Open these circuit breakers and attach DO-NOT-CLOSE identifiers:

 (a)  
Right Power Distribution Center, P415 1) 415H38, VENT FAN PWR BULK CARGO
　
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