747-400 AMM 飞机维护手册 空调 AIR CONDITIONING 2(179)

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747-400 MAINTENANCE MANUAL
 PACK TEMPERATURE CONTROLLER - REMOVAL/INSTALLATION
__________________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task is the removal of the pack temperature controllers. The second task is the installation of the pack temperature controllers.
 B.  There are two pack temperature controllers, A and B. The pack temperature controllers are in the main equipment center on the E2-4 electronics shelf.
 TASK 21-62-06-004-001
 2.  Pack Temperature Controller Removal (Fig. 401)___________________________________
 A.  References
 (1)  
20-11-22/401, Rack-Mounted Electrical/Electronic Module

 (2)  
24-22-00/201, Manual Control

 (3)  
45-10-00/201, Central Maintenance Computer System

 (4)  
AIPC 25-71-91 Fig. 1

 (5)  
AIPC 25-71-91 Fig. 1A

 (6)  
WDM 21-63-31

 (7)  
SSM 21-63-01

 B.  Access
 (1)  Location Zone
 118 Electrical/Electronic Compartment, RH

 C.  Procedure
 S 864-017
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 974-018

 (2)  
Operate the CMC to show the SHOP FAULT messages for the pack temperature controller and make a record of them (Ref 45-10-00/201).

 NOTE: This step is optional.
____
 S 864-002
 (3)  Make sure the PACKS 1, 2 and 3 switches are at OFF, on the P5 overhead panel.
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A
747-400
MAINTENANCE MANUAL

Pack Temperature Controller Installation
Figure 401

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A
747-400 MAINTENANCE MANUAL
 S 864-003
 (4) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
On P6 Main Power Distribution Panel 1) 6F35, PACK TEMP CONT A 2) 6F36, PACK TEMP CONT B

 (b)  
On P415 Power Distribution Center - Right 1) 415C38, PACK TEMP CONT B 2) 415K27, PACK TEMP CONT A

 S 024-004
 (5) Remove the pack temperature controller (Ref 20-11-22/401).
 TASK 21-62-06-404-005
 3.  Pack Temperature Controller Installation (Fig. 401)________________________________________
 A. References
 (1)  
20-11-22/401, Rack-Mounted Electrical/Electronic Module

 (2)  
21-51-00/501, Air Conditioning Pack System

 (3)  
24-22-00/201, Manual Control

 (4)  
AIPC 25-71-91 Fig. 1

 (5)  
AIPC 25-71-91 Fig. 1A

 (6)  
WDM 21-63-31

 (7)  
SSM 21-63-01

 B. Access
 (1)  Location Zone 118 Electrical/Electronics Compartment, RH
 C. Procedure
 S 424-006
 (1)
Install the pack temperature controller (Ref 20-11-22/401).

 S 864-012

 (2)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  On P6 Main Power Distribution Panel 1) 6F35, PACK TEMP CONT A
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A 747-400 MAINTENANCE MANUAL
 (b)  2) 6F36, PACK TEMP CONT BOn P415 Power Distribution Center - Right 1) 415C38, PACK TEMP CONT B 2) 415K27, PACK TEMP CONT A
 (3)  S 744-019Do the ground test for the pack temperature controller (Ref 21-51-00/501).
　
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