(3)  
IPC 21-58-10 Fig. 1

 B.  Access
 (1)  Location Zone 121 Forward Cargo Compartment Forward Half, LH
 C.  Procedure
 S 862-002
 CAUTION: DURING THE PROCEDURE THAT FOLLOWS, THE EQUIPMENT COOLING
_______ AIRFLOW WILL BE OFF. DO NOT OPERATE ELECTRICAL/ELECTRONIC EQUIPMENT THAT USES COOLING AIR OR THE EQUIPMENT CAN BECOME TOO HOT. THIS CAN CAUSE DAMAGE TO THE ELECTRICAL/ELECTRONIC EQUIPMENT.
 (1)  
Remove the electrical power (Ref 24-22-00/201).

 S 012-003

 (2)  
Remove the sidewall lining at station 615 of the left side of the forward cargo compartment (Ref 25-52-01/401).

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747-400
MAINTENANCE MANUAL

BYPASS VALVE (REF)
FWD

LOWER LOBE PLAN VIEW
Equipment Cooling Inlet Screen Location
Figure 201

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747-400 MAINTENANCE MANUAL
 S 032-005
 (3)  
Remove the screws and washers that attach the inlet screen to the ducts.

 S 022-006

 (4)  
Remove the inlet screen.

 S 032-007

 (5)  
Put a cover on the duct opening.

 TASK 21-58-11-402-008
 3.  Install the Equipment Cooling Inlet Screen__________________________________________
 A. References
 (1)  
24-22-00/201, Manual Control

 (2)  
25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings

 (3)  
IPC 21-58-10 Fig. 1

 B. Access
 (1)  Location Zone 121 Forward Cargo Compartment Forward Half, LH
 C. Procedure
 S 432-009
 (1)  
Remove the cover from the duct opening.

 S 422-010

 (2)  
Put the inlet screen in its position on the aft end of the equipment cooling duct.

 (3)  
Install the screws and washers to hold the inlet screen to the duct.

 S 412-015

 (4)  
Install the sidewall lining at station 615 of the left sidewall of the forward cargo compartment (Ref 25-52-01/401).

 S 432-011
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747-400 MAINTENANCE MANUAL
 TASK 21-58-11-102-017
 4.  Clean the Equipment Cooling Inlet Screen________________________________________
 A. Standard Tools and Equipment
 (1)
Vacuum Cleaner - Commercially Available

 (2)
G00618 Cloth - Dry, Lintfree

 B. Consumable Materials
 (1)
Solution - Soap and Water

 (2)
Clean Water

 C. Access
 (1)  Location Zone 121 Forward Cargo Compartment Forward Half, LH
 D. Procedure
 S 022-018
 (1)
Remove the inlet screen.

 S 142-033

 (2)
Clean the inlet screen:

 (a) Remove all the loose material from the inlet screen.
 NOTE: Use a vacuum cleaner or compressed air.
____
 (b)
Wash the inlet screen with soap and water.

 (c)
Rinse the inlet screen with clean water.

 (d)
Dry the inlet screen with a dry cloth.

 S 422-022
 (3) Install the inlet screen.
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