S 864-014

 (2)  
Remove the pneumatic pressure (AMM 36-00-00/201).

 S 864-016

 (3)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 414-009

 (4)  
Install the right sidewall lining which you removed
 (AMM 25-52-01/401).

 (5)  
Close the aft cargo compartment door.

 S 414-028
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 AFT CARGO COMPARTMENT CONDITIONED AIR CHECK VALVE - INSPECTION/CHECK
____________________________________________________________________
 1.  General_______
 A.  This procedure gives instructions to do an inspection of the aft cargo compartment conditioned air check valve. To get access to the check valve, you must go through the side wall panel in the aft cargo compartment.
 TASK 21-28-07-206-001
 2.  Inspect the Check Valve_______________________
 A.  References
 (1)  
AMM 21-28-07/401, Aft Cargo Compartment Conditioned Air Check Valve

 (2)  
IPC 21-28-00 Fig. 12

 B.  Access
 (1)  Location zone
 822 Aft Cargo Container Compartment Door

 C.  Procedure
 S 026-003
 (1)  
Remove the check valve (AMM 21-28-07/401).

 S 216-004

 (2)  
Inspect the check valve:

 (a)  
Make sure there is no corrosion or other damage to the check valve.

 (b)  
Make sure the valve does not have any crack.

 (c)  
Make sure there is no rupture on the valve.

 (3)
If one of the above condition occurs, replace the check valve.

 S 426-006

 (4)  
Do the aft cargo compartment conditioned air check valve installation (AMM 21-28-07/401).

 S 966-005
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 21-28-07
 ALL  ú ú 01 Page 601 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 CARGO AIR CONDITIONING FLOW REGULATING VALVES - REMOVAL/INSTALLATION
____________________________________________________________________
 1.  General________
 A.  The forward cargo air conditioning flow regulating valve is in the air conditioning bay aft of pack number three.
 B.  The aft cargo air conditioning flow regulating valve is in the right wing gear wheel.
 TASK 21-28-10-004-001
 2.  Forward Cargo Air Conditioning Flow Regulating Valve Removal____________________________________________________________
 A.  References
 (1)  
AMM 06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
SSM 21-28-07

 (3)  
WDM 21-28-41

 B.  Access
 (1)  
Location Zone
 134 Air Conditioning Equipment Bay, RH
 136 Wing Landing Gear Well, RH

 (2)  
Access Panel
 192MR Air Conditioning Access Panel

 C.  Prepare for Removal
 S 864-002
 (1)  
Make sure the number three PACKS switch on the P5 overhead panel is set to OFF.

 S 864-003

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

 (a)  
Main Power Distribution Panel, P6
 1) 6E36, FWD LWR A/C CONT CARGO

 (b)  
Right Power Distribution Center, P415 1) 415L28, LWR FWD CGO FRV FSO

 S 014-004
 (3)  Lower the access panel 192MR on the air conditioning equipment bay (AMM 06-09-03/201).
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