S 022-025
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747-400 MAINTENANCE MANUAL
 S 422-026
 (5)  Reconnect the applicable electrical connector to the compressor discharge overheat switch:
 -DS520 for pack 1
 -DS517 for pack 2
 -DS522 for pack 3
 S 212-027
 (6)  Make sure that the SYS FAULT light goes off when you push the PACK RST switch.
 F. Put the Airplane Back to its Usual Condition
 S 412-028
 (1)  Close the applicable access door (AMM 06-09-03/201):
 -191A-L for pack 1
 -191H-L for pack 2
 -192A-R for pack 3
 S 862-029
 (2)  
Make sure the applicable (1, 2, or 3) PACKS selector, on the overhead panel, P5, is in the OFF position.

 S 862-038

 (3)  
Remove the DO-NOT-CLOSE tag and close these circuit breakers, on the P6 Main Power Distribution Panel:

 (a)  
6F35, PACK TEMP CONT A

 (b)  
6F36, PACK TEMP CONT B

 (4)  
Remove the electrical power if it is not needed (AMM 24-22-00/201).

 S 862-030
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747-400 MAINTENANCE MANUAL
 WATER ASPIRATOR - REMOVAL/INSTALLATION
______________________________________
 1.  General_______
 A.  This procedure has instructions to remove and install the water aspirators. One water aspirator is installed at the interface of the ram-air duct and the heat exchanger of each air cooling pack.
 TASK 21-51-11-004-001
 2.  Water Aspirator Removal (Fig. 401)_______________________
 A.  References
 (1)  
06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
21-51-11/501, Water Aspirator

 (3)  
IPC 21-51-60, Fig. 1, 2 and 3

 B.  Access
 (1)  
Location Zone
 133 Air Conditioning Equipment Bay, LH
 134 Air Conditioning Equipment Bay, RH

 (2)  
Access Panel
 191E-L Air Conditioning Access Panel
 191N-L Air Conditioning Access Door
 192E-R Air Conditioning Access Panel

 C.  Prepare for the Removal
 S 864-002
 (1)  Turn the applicable (1, 2, or 3) PACKS selector, on the overhead panel, P5, to the OFF position.
 (a)  Put a DO-NOT-OPERATE tag on the selector.
 S 014-003
 (2)  Open or remove the applicable access door or panel (Ref 06-09-03/201):
 -191E-L for pack 1 (access panel)
 -191N-L for pack 2 (access door)
 -192E-R for pack 3 (access panel)
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747-400 MAINTENANCE MANUAL
SEE A
FWD 
SEE  A 
AIR CONDITIONING 
EQUIPMENT BAY 
AIR INLET 
TUBE 
BUSHING 
NOZZLE 
ASPIRATOR  0-RING 
ASSEMBLY  REDUCER 
O-RING 
WATER INLET HOSE 
HEAT  TEE 
EXCHANGER 
HEADER  BULKHEAD NUT 
DUCT 
BACKUP RING 
O-RING 
FWD 
HEADER 
BOSS (REF)  A  HEAT EXCHANGER 
Water Aspirator Installation 
Figure 401 

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