C.  The aft cargo heat control and override valves are installed on the inboard bulkhead of the right body wheel well.
 TASK 21-44-01-004-001
 2.  Valve Removal (Fig. 401)_____________
 A.  References
 (1)  
AMM 09-11-00/201, Towing

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 32-00-30/201, Landing Gear Door Locks

 (4)  
AMM 36-00-00/201, Pneumatic System

 (5)  
AIPC 21-44-00 Fig. 1A

 (6)  
AIPC 21-44-00 Fig. 5

 (7)  
AIPC 21-44-00 Fig. 7

 (8)  
WDM 21-44-11, 21-44-12

 (9)  
SSM 21-44-01

 B.  Access
 (1)  Location Zone
 136 Wing Landing Gear Well, RH
 138 Body Landing Gear Well, RH

 C.  Procedure
 S 864-002
 (1)  
Apply electrical power (AMM 24-22-00/201).

 (2)
Release the pressure in the pneumatic system (AMM 36-00-00/201).

 S 864-004

 (3)  
Push the ECS switch on the EICAS Display Select Panel.

 S 864-003
 (a)  Make sure the EICAS ECS synoptic display shows that the DUCT PSI left and right are approximately zero.
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 21-44-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

INBOARD 
BODY LDG GEAR 
SEE  A  WHEEL WELL 
BULKHEAD 
AFT CARGO 
TRIM VALVES 
PNEUMATIC 
DUCT 
BONDING 
JUMPERS 
ELECTRICAL 
CONNECTOR 
OVERRIDE 
VALVE  ELECTRICAL  CONTROL 
CONNECTOR  CLAMPS  VALVE  A 
Aft Cargo Heat Valves - Installation 
Figure 401 

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 ALL  ú ú 04 Page 402 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 864-005
 (4)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P7 Overhead Circuit Breaker Panel
 1) 7H09 CARGO HEAT AFT

 (b)  
P415 Power Distribution Center - Right 1) 415L29 AFT CARGO HEAT PWR

 S 494-006
 (5)  Make sure the landing gear ground locks are installed (AMM 09-11-00/201).
 S 494-032
 WARNING: MAKE SURE THAT ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE DOOR
_______ OPERATION AREA. FAST MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT. REFER TO AMM 32-00-30/201 FOR LANDING GEAR DOOR LOCK INSTALLATION PROCEDURE.
 (6)  
Install the body and the wing gear door locks (AMM 32-00-30/201).

 S 034-008

 (7)  
Remove the electrical connector from the valve.

 (a)  
The aft cargo control valve electrical connector - DV10

 (b)  
The aft cargo override valve electrical connector - DV11

 S 034-010
 (8)  Remove the bonding jumpers from the valve (2 locations).
 S 034-011
 WARNING: MAKE SURE THERE IS NO PRESSURE IN THE PNEUMATIC MANIFOLD BEFORE
_______ YOU REMOVE THE VALVE. THE REMOVAL OF THE VALVE WITH THE PNEUMATIC MANIFOLD PRESSURIZED CAN CAUSE INJURY TO PERSONS
 (9)  
Remove the clamps from each end of the valve and remove the valve.

 S 034-013

 (10)
 Put covers on the duct openings to prevent entry of unwanted objects.

 TASK 21-44-01-404-014
 3. Valve Installation (Fig. 401)
__________________
 A. References
 (1)  AMM 09-11-00/201, Towing
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