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 S 864-008
 (2)  Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P414, Left Power Distribution Center 1) 414A24, WASTE AND WATER LINE HTR MN PWR 2) 414D5, WASTE AND WATER LINE HTR MN PWR 3) 414L22, DRAIN MAST HTR AIR FWD 4) 414L23, DRAIN MAST HTR AIR CTR 5) 414L24, DRAIN MAST HTR AIR AFT 6) 414C21, DRAIN MAST HTRS GND SVCE MODE
 S 714-009
 (3)  Do a test of the ribbon heater operation (AMM 30-71-00/501).
 S 414-011
 (4)  Install the floor or sidewall panels which you removed for access.
 S 864-010
 (5)  Remove electrical power (AMM 24-22-00/201).

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 30-71-01
 ALL  ú ú 01 Page 404 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 HEATED SUPPLY HOSE - REMOVAL/INSTALLATION
_________________________________________
 1.  General_______
 A.  This subject has two tasks, one for the removal and one for the installation of the heated supply hose which supplies potable water. In this procedure, you will get access to the hose, cut the electrical leads, remove the hose, and make a splice to install the replacement hose.
 B.  The removal and installation procedures for all heated supply hoses are the same.
 TASK 30-71-02-004-001
 2.  Heated Supply Hose Removal__________________________
 A.  References
 (1)  
AMM 38-15-00/201, Water System Pressurization

 (2)  
SSM 30-71-01

 (3)  
SWPM 20-30-12

 (4)  
WDM 30-71-11, WDM 30-71-12, WDM 30-71-13, WDM 30-71-14

 B.  Access
 (1)  Location Zone 125 thru 152 Lower Lobe (Refer to WDM for heater locations)
 C.  Procedure
 S 864-002
 (1)  
Open 414A24, WASTE & WATER LINE HTR MN PWR and 414D5, WASTE & WATER LINE HTR MN PWR circuit breakers on the P414, Left Power Distribution Center.

 S 844-003

 (2)
Do this task: "Depressurize Water System" (AMM 38-15-00/201).

 (3)  
Get access to the applicable heated supply hose.

 S 034-016

 (4)  
Cut the electrical leads on the heated supply hose (SWPM 20-30-12).

 S 014-004
 NOTE:____Let the cut electrical leads stay where they are. This will help you to find the splice. Remove them when you make a splice with the new leads.
 S 034-006
 (5)
Release the clamps along the length of the heated supply hose.

 (6)  
Remove the heated supply hose.

 S 024-007
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 30-71-02
 ALL  ú ú 01 Page 401 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TASK 30-71-02-404-008
 3.  Heated Supply Hose Installation_______________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 30-71-00/501, Water Line and Waste Drain Heaters

 (3)  
AMM 38-15-00/201, Water System Pressurization

 (4)  
AIPC 30-71-02, Fig. 1

 (5)  
SSM 30-71-01

 (6)  
SWPM 20-30-12

 (7)  
WDM 30-71-11, WDM 30-71-12, WDM 30-71-13, WDM 30-71-14

 B. Access
 (1)  Location Zone 125 thru 152 Lower Lobe (Refer to WDM for heater locations)
 C. Procedure
 S 424-009
 (1)  
Install the heated supply hose with its clamps.

 S 434-017

 (2)  
Find the splice area and make a splice of the electrical leads (SWPM 20-30-12).

 S 864-011

 (3)  
Close 414A24, WASTE & WATER LINE HTR MN PWR and 414D5, WASTE & WATER LINE HTR MN PWR circuit breakers on the P414, Left Power Distribution Center.

 (4)
Do this task: "Pressurize Water System" (AMM 38-15-00/201).

 (5)  
Do a test of the heated supply hose (AMM 30-71-00/501).
　
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