(2)  
IPC 21-32-00, Fig. 1

 B.  Access
 (1)  Location Zone 123 Forward Cargo Container Compartment Aft Half, LH
 C.  Procedure
 S 014-002
 (1)  
Remove the sidewall lining from the left side of the forward cargo compartment at Sta 770 (Ref 25-52-01/401) to get access to the pressure relief valves.

 S 034-003

 (2)  
Turn the filter cap to remove it from the valve.

 S 024-004

 (3)  
Remove and discard the filter and the packing ring.

 TASK 21-32-02-404-005
 3.  Install the Pressure Relief Valve Filter (Fig. 401)
________________________________________
 A.  Consumable Materials
 (1)  
D00404 Oil - Silicone DC 200, Gr 100,000 CS

 (2)  
B00557 Isopropyl Alcohol

 (3)  
G01043 Lint-free cloth

 B.  References
 (1)  
25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings

 (2)  
IPC 21-32-00, Fig. 1

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 21-32-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

SEE A
PRESSURE RELIEF VALVE (2)
FILTER CAP
A
Pressure Relief Valve Filter InstallationFigure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-32-02
 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

 C. Access
 (1)  Location Zone 124 Forward Cargo Container Compartment Aft Half, LH
 D. Procedure
 S 114-006
 (1)  
Clean the filter recess and the filter cap with a lint-free cloth, that is moist with isopropyl alcohol.

 S 144-012

 (2)  
Dry the filter recess with a clean, lint-free cloth.

 S 284-007

 (3)  
Make sure the orifice at the bottom of the filter housing is not blocked.

 S 644-008

 (4)  
Lubricate the new packing ring with silicone oil and install the packing ring on the new filter.

 S 424-009

 (5)
Install the filter and the packing ring into the filter housing.

 S 434-010

 (6)  
Install the filter cap.

 (7)  
Install the sidewall lining (Ref 25-52-01/401).

 S 414-011
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 21-32-02
 ALL  ú ú 01 Page 403 ú Jun 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
HEATING
COMPONENT  FIG. 102 SHT  QTY  ACCESS/AREA  REFERENCE AMM 
HEATER - CAPTAIN'S FOOT - LEFT, H519  1  1  FLT COMPT  21-42-01 
HEATER - CAPTAIN'S FOOT - RIGHT, H520  1  1  FLT COMPT  21-42-01 
HEATER - CAPTAIN'S SHOULDER, H523 2  1  FLT COMPT  21-42-02 
HEATER - FIRST OFFICER'S FOOT - L, H521  1  1  FLT COMPT  21-42-01 
HEATER - FIRST OFFICER'S FOOT - R, H522  1  1  FLT COMPT  21-42-01 
HEATER - FIRST OFFICER'S SHOULDER, H524  2  1  FLT COMPT  21-42-02 
HEATER - FWD CARGO - L, H525  3  1  FWD CARGO COMPT, FWD HALF, LEFT  21-43-01 
HEATER - FWD CARGO - R, H526  3  1  FWD CARGO COMPT, FWD HALF, RIGHT  21-43-01 
MODULE - CAPTAIN'S HEATER CONTROL, M7375  1  1  FLT COMPT, P44  21-42-05 
MODULE - FIRST OFFICER'S HEATER CONTROL,  1  1  FLT COMPT, P45  21-42-05 
M7376 
SWITCH - AFT CARGO COMPT TEMP SEL, S1035  4  1  BULK CARGO COMPT, RIGHT  * 
　
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