25-40-00
 ALL  ú ú 02 Page 3 ú Jun 10/94
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A
747-400 MAINTENANCE MANUAL
 UPPER DECK LAVATORIES - REMOVAL/INSTALLATION
____________________________________________
 1.  General_______
 A.  This procedure contains these tasks:
 (1)  
The removal of the Upper Deck Lavatories.

 (2)  
The installation of the Upper Deck Lavatories.

 B.  Do not service the potable water system after you have serviced the lavatory waste system. It is possible to spread contaminants to other components.
 C.  Wear protective gloves to cover open breaks in your skin. Wash your hands before you service other systems.
 D.  Restrain all of the loose components not removed from the lavatory.
 E.  Cover the decorative trim to prevent damage.
 F.  Make sure the tubing, hoses, and wiring are positioned clear of the airplane structure.
 TASK 25-40-03-404-058
 2.  Upper Deck Lavatory - Removal (Fig. 401)_____________________________
 A.  Standard Tools and Equipment
 (1)  Caps and Plugs - Package of Clean Protective
 B.  References
 (1)  
AMM 25-22-03/401, Upper Deck Ceiling Panels

 (2)  
AMM 25-25-01/401, Passenger Seats

 (3)  
AMM 35-00-00/201, Oxygen

 (4)  
AMM 38-15-00/201, Water Tank Pressurization

 (5)  
AMM 38-32-01/401, Toilet Assembly

 (6)  
IPC 25-40-03

 (7)  
WDM 24-51-26

 (8)  
WDM 24-51-46

 (9)  
WDM 24-54-11

 (10)
 WDM 24-54-41

 (11)
 WDM 24-54-24

 (12)
 WDM 24-54-44

 (13)
 WDM 25-41-11

 (14)
 WDM 33-26-01

 (15)
 WDM 33-26-11

 C.  Access
 (1)  Location Zone
 223 Fwd Upper Deck Passenger Cabin, LH
 224 Fwd Upper Deck Passenger Cabin, RH

 D.  Procedure
 S 864-002
 (1)  Open these circuit breakers for the upper deck lavatory and attach DO-NOT-CLOSE tags:
 (a)  
P180 DC Power Distribution Panel
 1) 180F18 LAV SMOKE DET 1
 2) 180F3 LAV SMOKE DET 2
 3) 180F19 LAV LOCK DOOR IND

 (b)  
P85 Panel 1) LAV WASTE BLO & AFT TANK FLUSH CONTROL L

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A
747-400
MAINTENANCE MANUAL

FITTING
DOOR
A-A Upper Deck Lavatory Installation, Freighter Figure 401 (Sheet 1)
C86154
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 25-40-03
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747-400
MAINTENANCE MANUAL

LAVATORY RING WALL FITTING
WASTE SERVICE LINE (EXAMPLE)

A
LAVATORY LAVATORY
WALL WALL

FLOOR
PANEL
(REF)

C-C
Upper Deck Lavatory Installation
Figure 401 (Sheet 2)

C86911
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 25-40-03
 ALL  ú ú 06 Page 403 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 2) LAV WASTE BLO & AFT TANK FLUSH CONTROL R 3) LAV WASTE FWD TANK FLUSH CONTROL L 4) LAV WASTE FWD TANK FLUSH CONTROL R
 (c)  
P414 Power Distribution Center Left
 1) 414A11 CABIN SVCE UPPER DECK
 2) 414J18 LAV LIGHT FWD
 3) 414R21 WATER SYS AIR COMPRESSOR
　
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