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 S 712-025
 (7)  Make sure the air compressor stops after approximately five minutes. (a) If the compressor does not stop in approximately five minutes, check for leaks in the pressure switch connection. 1) If there are leaks in the pressure switch connection, repair all of the leaks. 2) If there are no leaks in the pressure switch connection, do the steps that replace the pressure switch.
 S 412-020
 (8)  Do the "Containerized Cargo Compartment Ceiling and Sidewall Linings Installation" task (AMM 25-52-01/401) to install the sidewall and ceiling panels.
 S 862-022
 (9)  Remove the DO NOT CLOSE tag on P180 DC Power Distribution Panel and close this circuit breaker:
 (a)  180G15 POTABLE WATER FILL AND OVERFLOW VALVES
 S 862-021

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

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 38-15-67
 ú ú 01 Page 205 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 COMPRESSOR RELAY - REMOVAL/INSTALLATION
_______________________________________
 1.  General
_______
 A.  This procedure includes two tasks:
 (1)  
The removal of the air compressor relay for the potable water system.

 (2)  
The installation of the air compressor relay for the potable water system (relay).

 B.  The installation task of the relay includes an operational check of the installed relay.
 C.  The relay (No. 859) is in the center equipment panel, P54, in the electrical and electronics compartment.
 TASK 38-15-68-004-015
 2.  Relay Removal
_____________
 A.  References
 (1)  
AMM O9-02/201, Body Section 42 Access Doors and Panels

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

 B.  Access
 (1)  
Location Zone 118 Electrical and Electronics Compartment, RH

 (2)  
Access Panel
 125B Electronic Access Door

 

 C.  Procedure
 S 864-016
 WARNING: YOU MUST REMOVE ELECTRICAL POWER FROM THE AIRPLANE WHEN YOU DO
_______ WORK IN THE CENTER EQUIPMENT PANEL. THE HIGH VOLTAGES CAN CAUSE INJURY TO PERSONS.
 (1)  
Remove electrical power (AMM 24-22-00/201).

 (2)
Open the electronics access door, 125B (AMM 06-09-02/201).

 (3)  
Open the access door for the center equipment panel.

 (4)
Remove the mounting screws from the relay mounting bracket.

 (5)  
Remove the relay from the relay socket.

 S 014-017
 S 014-018
 S 024-019
 S 024-020
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 38-15-68
 ALL  ú ú 01 Page 401 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TASK 38-15-68-404-021
 3. Relay Installation
__________________
 A. References
 (1)  
AMM 06-09-02/201, Body Section 42 Access Doors and Panels

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

 (3)  
AMM 36-00-00/201, Pneumatic

 (4)  
AMM 38-15-60/201, Water System Pressurization

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

 (2)  
Access Panel
 125B Electronic Access Door

 

 C. Procedure
 S 864-022
 WARNING: YOU MUST REMOVE ELECTRICAL POWER FROM THE AIRPLANE WHEN YOU DO
_______ WORK IN THE CENTER EQUIPMENT PANEL. THE HIGH VOLTAGES CAN CAUSE INJURY TO PERSONS.
 (1)  
Remove electrical power (AMM 24-22-00/201).

 S 424-023

 (2)  
Install the relay.

 S 424-024

 (3)  
Install the fasteners.

 S 714-025

 (4)  
Do a check of the relay operation.

 (a)  
If the pneumatic manifold is pressurized, do this task: "Release the Pressure in the Pneumatic System" (AMM 36-00-00/201).
　
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